HEADQUARTERS
1ST BATTALION (MECH) 5TH INFANTRY
APO San Francisco 96225
SUBJECT: Combat After-Action Report (RCS: MACV J3-32)
TO: Commanding Officer
2d Brigade
25th Infantry Division
ATTN: AVDCSB-T
APO U.S. Forces 96225
1. NAME OF OPERATION: Operation KOKO HEAD
2. DATES OF OPERATION: 240700JUL66 - 061640AUG66
3. LOCATION: Liocara Plantation (XT 6422), Ho Bo Woods and vic (XT 6527 - XT 6424 - XT 6123) and Trung Lap and vic (XT 5021), Hau Nghia Province, Viet Nam
4. COMMAND HEADQUARTERS: 1st Bn (Mech), 5th Inf.
5. REPORTING OFFICER: Lt Col Victor F. Diaz
9. MISSION: 1st Bn (mech) (-), 5th Inf conducts S&D operations in 2d Bde AO on order; provides mechanized reaction force on order.
10. CONCEPT OF OPERATION: The 1st Bn (Mech)(-), 5th Inf based at Cu Chi conducts local S&D operations, civil affairs activities, maintenance and retraining; is prepared for employment as base reaction force on order.
11.
EXECUTION:
24 July 1966: The village chief of Tan Phu Trung (XT 6809) offered the assistance of a Popular Forces soldier and a Chieu Hoi to locate tunnels vic XT 700110 which were being used by the VC. Co A and Recon Plat were dispatched to the area. After a thorough search, four well camouflaged huts, bunkers and tunnels were located and destroyed. Several documents, one Chicom carbine and two VC suspects were also captured.
25 July 1966: The battalion (-) conducted retraining and maintenance.
26 July 1966: The battalion (-) conducted retraining, maintenance and convoy security missions to Bao Tri (XT 5204). Co B was attached to the 2/27th Inf.
27 July 1966: Eight daylight ambushes were established. One made contact vic XT 516309 at 1455 hours, resulting in two VC killed (BC) and one U.S. carbine, one Chicom carbine, three hand grenades, 50 rounds small arms ammunition and miscellaneous documents captured. The battalion (-) departed at 0800 hours to conduct S&D operations south of the Boi Loi Woods vic XT 5130 (Incl 1, Operation Overlay). Company A operated in Obj SAM and Obj HARRY apprehending eight VC suspects. Co B was relieved from the 2/27th Inf and joined the battalion (-) enroute to the AO. They then operated in Obj JOE, Obj BILL and Obj TOM. Several ambushes were set along the southern edge of the Boi Loi and at 1455 hours two VC were killed (BC) and two rifles captured. The Recon Platoon initially blocked for Co B on Obj JOE then conducted operations vic XT 480297 where 15 VC suspects were apprehended. (Eight of the suspects apprehended were confirmed as VC by the 25th Div IPW team.) The battalion (-) established a fire support base vic XT 479271 and Btry C (-), 1/8th Arty (105mm How) was airlifted in to support the battalion (-). Co C returned to the rear basecamp at 1830 hours terminating their attachment to the 4/9th Inf.
28 July 1966: Eight ambushes were established during darkness 27-28 July. None made contact and all returned at first light. The battalion (-), assisted by the local RF platoon, encircled the village of Loc Hung (XT 5226) and apprehended 19 VC suspects, of which five were confirmed to be Viet Cong.
29 July 1966: Seven ambushes were established during darkness 28-29 July. One made contact at 2030 hours vic XT 482295. Two WIA were sustained; enemy casualties were unknown. The ambush returned to Bn base. All other ambushes returned at first light. The battalion (-) continued operations in the AO (Incl 2, Operation Overlay) which netted one VC and 15 suspects. The battalion CP remained in position to secure the LZ for extraction of the Arty battery. By 1830 hours the battalion had returned to base camp.
30 July 1966: Battalion activities included maintenance, conduct of civil affairs operations at Tan Phu Trung (XT 6809) and escort of an Artillery convoy from Duc Hue (XT 4405) to base camp.
31 July 1966: Lt Col Victor F. Diaz assumed command of the 1st Bn (Mech), 5th Infantry vice Lt Col T. U. Greer. The battalion conducted maintenance and prepared for future operations.
1 August 1966: The battalion departed base camp at 0725 hours on a mission of exploiting and determining the effectiveness of a B52 bomb strike vic XT 640225 - XT 665240. In conjunction with this mission the battalion conducted S&D operations in the AO (Incl 3, Operation Overlay).
Company A: The company, with Recon Platoon attached, established blocking position X-RAY, then exploited the bomb strike on Obj 2. With the exception of three AT mines, the company had no enemy contact. An extensive bunker-tunnel complex was discovered vic XT 640229. Another tunnel complex was found vic XT 645227. There was little or no evidence of the B52 strike in the objective area.
Company B: The company moved to clear and hold Obj 1 until passage of Company A, then conducted a detailed search vic XT 646215. A bunker-tunnel complex was discovered vic XT 643217 which contained an ammo cache of small arms ammo, grenades and AT mines. After completing the search the company moved to Obj 13. At 1650 hours two houses were found vic XT 624243 containing a rifle, 15 artillery rounds, 2 AT mines, documents and medicine.
Company C: The company departed base camp at 0725 hours moving through OP Ann Margaret along Axis WHITE to conduct S&D operations to Obj 3, XT 622231. The company arrived in the AO at 0908 hours and between 0917 hours and 0956 hours found and destroyed five bunkers vic XT 621230. Ineffective small arms fire was received throughout the morning but no casualties were sustained. Found and destroyed vic XT 623227 were an extensive tunnel complex with new punji pits around the entrance. Found inside the complex were fresh food on a table and recent signs of much activity. At 1305 hours an element found a letter containing North Vietnamese money vic XT 623277. Also found in the same area were one canteen, a holster and miscellaneous small arms ammunition. At the same time elements vic XT 619233 destroyed one 105mm dud and one 155mm dud, both rigged for command detonation and boobytrapped in a tunnel in the area. Three VC were located in a bunker-tunnel complex vic XT 619233 at 1338 hours. In the maneuver against the bunker two WIA were sustained resulting from a command detonated mine at 1351 hours. Another WIA was sustained at 1405 hours from another command detonated mine in the same area. All attempts to force the VC from the complex failed and the complex was destroyed with demolitions. Found vic XT 623277 at 1405 hours was one U.S. 1917 Eddystone rifle. Found vic XT 619233 at 1600 hours were eight homemade hand grenades and miscellaneous field equipment. At 1600 hours the company removed the top from a bunker in the area and found six hand grenades and miscellaneous small arms ammunition. At 1700 hours the company departed enroute to the battalion perimeter.
2 August 1966: The battalion established ten ambushes during darkness 1-2 August. No contact was made and all returned at first light. The battalion received the mission of exploiting the northern half of the 2/27th Inf objective area and departed at 0715 hours. Co A maintained its blocking position until 1140 hours then joined the battalion vic XT 646236. Co B conducted its operation vic XT 650257. Several new tunnels, bunkers and spider holes were found and destroyed vic XT 646239. Co C was diverted to vic XT 639240 after receiving small arms fire from a house. The area was thoroughly searched and one VC captured. Several maps and documents were also found in this boobytrapped area. The 2/27th Inf was relieved of its mission and at 1455 hours Co C was dispatched to assist in their move to Trung Lap. The 1/5th Mech then assumed responsibility for the entire AO.
3 August 1966: Eight ambushes were established during darkness 2-3 August, none of which made contact and all of which returned at first light. The battalion conducted an extensive search in the objective area (Incl 4, Operation Overlay), which showed several indications of recent use by the VC. Co A killed two VC in a tunnel and dragged their bodies out; a third VC refused to come out and the tunnel was destroyed. Co B found extensive tunnel-bunker systems in their objective area along with ammunition, medical supplies and large amounts of propaganda material. 60mm mortar firing positions and containers were also found in the area. Co C also discovered an extensive tunnel-bunker system in its area which was ringed with CBU bomblet booby traps. Uniforms and gas masks were found in the tunnel. The Recon Platoon encountered an extensively booby trapped area which was defended with command detonated mines. Two VC were encountered in a tunnel, one of which was killed and extracted. The other was buried when the tunnel was destroyed.
4 August 1966: The battalion established nine ambushes during the hours of darkness 3-4 August. None made contact and all returned at first light. Throughout the day the battalion conducted post-strike analysis in the AO immediately after the 040715AUG66 B-52 strike (Incl 5, Operation Overlay).
Company A: The company departed the battalion perimeter at 0715 hours enroute to the AO. By 0827 hours the company had arrived in the AO and at 0909 hours elements found one VC claymore, miscellaneous small arms ammunition and several miscellaneous documents, including a company roster (possible unit designation: H-1B) vic XT 653274. At 1045 hours a cache containing approximately 60 black uniforms and several bolts of cloth was found vic XT 651281. Four slight WIA were sustained and an APC was damaged extensively when the vehicle hit an AT mine vic XT 655275 at 1210 hours. Found in the same area were two VC bodies - an apparent result of the morning's B-52 strike. Recovered with the bodies were one U.S. carbine and one Russian assault rifle. Continued search of the AO revealed a heavily booby trapped and mined area containing several houses vic XT 675281. After completion of S&D operations the company returned to the battalion perimeter.
Company B: The company departed the battalion perimeter for the AO at 0715 hours, arriving at 0920 hours, and began its S&D operations. At 0925 hours 900 pounds of loose rice was found vic XT 653282. Two command detonated mines were set off and small arms fire was received vic XT 654282 at 1000 hours. There were no casualties. An old carbine, in unusable condition, was found in a hole vic XT 657281. At 1100 hours two VC with one weapon were trapped in a bunker-tunnel complex vic XT 657281. The weapon, a Chicom carbine, was captured, but all attempts to coax the VC from the tunnel were unsuccessful and the VC were killed (est) when the complex was destroyed with demolitions. At 1520 hours one APC hit an AT mine vic XT 657282. There were no casualties. At 1533 hours another APC hit an AT mine in the same location. One minor WIA was sustained. At 1700 hours the company completed its S&D operations and returned to the battalion perimeter.
Company C: The company departed the battalion perimeter at 0715 hours and while enroute to the AO several recently traveled, heavily used trails were found vic XT 621256 and XT 648249. Two bunkers were destroyed at 1008 hours vic XT 648249. At 1036 hours automatic weapons and small arms fire was received from vic XT 660257. Mortar fire was called in and the VC broke contact. There were no casualties. At 1101 hours one friendly KIA and one serious WIA resulted from an exploding booby trap vic XT 658259. At 1132 hours one KIA and three WIA were sustained during the investigation of a booby trapped bunker vic XT 658259. All casualties were evacuated. At 1514 hours a blood trail, as well as a pair of sandals with bits of flesh in them and a bandoleer of 7.92mm ammo, were found near a sampan vic XT 667261. The sampan was sunk in the river where the blood trail ended. The company finished its S&D operations at 1700 hours and returned to the battalion perimeter.
Recon Platoon: At 0745 the platoon departed for Trung Lap, escorting the battalion's downed vehicles. The escort mission was completed at 0900 hours, at which time the platoon started its return movement to the AO. Between 1425 hours and 1552 hours the platoon screened the northwest flank of the objective area. After the completion of the mission the platoon returned to the battalion perimeter.
5 August 1966: The battalion established eight ambushes during the hours of darkness 4-5 August. None made contact and all returned at first light. The battalion conducted maintenance during the early morning. At 0932 hours the battalion commenced a reconnaissance in force in areas DOVE and RAVEN (Incl 6, Operation Overlay). The battalion CP was moved to vic XT 569241.
Company A: At 0934 the company began its movement to Area RAVEN (Obj 6), searching along Axis JAN in areas 3, 7 and 2. Ineffective small arms fire was received at 1040 hours from vic XT 594265. A heavy volume of automatic weapons fire was returned and the VC broke contact. Ten VC were spotted in a woodline vic XT 573287 at 1140 hours. The VC were pursued but all attempts to make contact were unsuccessful. At 1500 hours the company arrived at the battalion CP.
Company B: The company began its movement at 1023 hours moving to Obj 10, searching along Axis PEG in areas 8 and 1. One 250 pound bomb and a house were destroyed vic XT 613266 at 1106 hours. Another house and two boobytraps were destroyed vic XT 614247. There was a warm fire site in the area. One male VCS was apprehended vic XT 614222 at 1614 hours. The suspect was seen in the company of a VC with a rifle; however, the VC escaped. At 1700 all elements returned to the Bn CP.
Company C: At 0938 hours Co C began its movement to Area RAVEN (Obj 6) searching along Axis LISA to areas 5, 12, 13 and 4. Enroute, at 1013 hours, an element found a 55 gallon drum of motor oil, civilian manufactured ("Shell"), in a U.S. type drum marked "Gasoline" vic XT 622268. Also found in the area were a trail with fresh footprints and one booby trapped CBU bomb. A squad size assembly area was found and destroyed vic XT 623260 (1128 hours). The area appeared to have been used three days prior. At 1239 hours a large bunker-tunnel complex was found and destroyed in a heavily booby trapped area vic XT623256. After the completion of its mission the company returned to the battalion CP (1800 hours).
Recon Platoon: The platoon departed the battalion CP at 0932 hours and moved to Area RAVEN (Obj 6). At 1105 hours two bunkers (one steel reinforced) were found and destroyed vic XT 620274. Also destroyed were a 30 meter tunnel and one 250 pound bomb. The area was found to be heavily booby trapped and miscellaneous hand grenade parts, 20-30 pounds of lead rods and 200 pounds of polished rice were found in the vicinity. At 1203, in the same area, the platoon destroyed five hand grenades, two bunkers. During this period seven rifle grenades were fired into the area. There were no casualties. The search continued with the platoon destroying three more steel and log reinforced bunkers and eight hand grenades. 300 pounds of polished rice was also found. At 1638 hours the platoon returned to the battalion perimeter.
6 August 1966: No ambushes were established. The battalion, participating in a 2d Bde "seal and search" operation, established blocking positions vicinity grid squares XT 5821, 5921, 5820, 5920, 5819 and 5919. The operation was completed at 1540 hours. All units closed Cu Chi base camp at 1753 hours.
Company A: The company departed the battalion perimeter at 0500 hours and moved to vic XT 594212 into blocking positions. S&D operations were conducted in the immediate area. The blocks remained in position until 1540 hours, at which time the company began the extraction of downed vehicles and returned to base camp at Cu Chi.
Company B: Departing the battalion perimeter at 0500 hours, the company moved to vic XT 594220 and established blocking positions. The company then conducted S&D operations in the immediate area. Throughout the day numerous civilians were questioned and released. At 1540 hours the company consolidated and returned to Cu Chi base camp.
Company C: The company departed the battalion perimeter at 0500 hours and moved to vic XT 585119, established blocking positions and conducted S&D operations in the area. Several civilians were detained and questioned; however, all were released. At 1540 hours the company departed the area and returned to base camp.
Recon Platoon: The platoon established a POW Collecting Point vic XT 591210. Throughout the day several civilians that were detained were questioned and released. At 1540 hours the platoon departed, escorting the battalion CP and all downed APC's to Cu Chi.
Battalion Command Group: The battalion command group departed the area at 0500 hours following the major elements displacing to XT 595203. Enroute, at 0545 hours, the battalion operations APC hit an AT mine vic XT 573232. The vehicle was damaged beyond repair and later destroyed by demolitions. Three WIA were sustained, of which two were treated and returned to duty and one was evacuated. At 1410 hours the battalion C&C helicopter was knocked to the ground by a mine as it lifted over a bamboo hedgerow approximately 15 feet in the air (XT 577231). The aircraft was extensively damaged and later extracted. In the crash the Battalion Commander, Battalion S3 and the pilot were wounded. The Battalion Commander was evacuated and the Battalion S# and the pilot were treated and returned to duty. The Hvy Mort Plat traveled with the battalion command group and had one APC that hit an AT mine vic XT 575228 at 1205 hours. The vehicle was extensively damaged and four WIA were sustained. Three were evacuated; one was treated and returned to duty.
14. SPECIAL EQUIPMENT AND TECHNIQUES: None