CAC Combined Action Company CACO Combined Action Company Oscar CavSqd (e.g. 1/9) 1st Squadron, 9th Cavalry C-4 Plastic explosives CG, 1st MarDiv Commanding General, 1st Marine Division CG, FMFPac Commanding General, Fleet Marine Force, Pacific CG, 3d MarDiv Commanding General, 3d Marine Division CG, III MAF Commanding General, III Marine Amphibious Force ChiCom Chinese Communist CH-53A Sea Stallion U. S.-built, single-rotor, heavy assault transport helicopter powered by two shaft-turbine engines with an average payload of 12,800 pounds. Full-sized rear opening with built-in ramp permits loading of 105mm howitzer and carriage. External sling will accommodate a 155mm howitzer (towed). Carries crew of 3 plus 38 combat troops or 24 litters. Built by Sikorsky. CH-46D Sea Knight U. S.-built, medium transport, twin-turbine, tandem rotor helicopter with an average payload of 4,800 pounds. Has rear loading ramp and external sling mount. Carries crew of 3 plus 25 combat troops or 15 litters and 2 attendants. Built by Boeing. CIDG Civilian Irregular Defense Group Claymore U. S.-built, directional antipersonnel land mine employed above ground and normally in an upright position. CMC Commandant of the Marine Corps CmdChron Command Chronology CO Commanding Officer ComUSMACV Commander, U. S. Military Assistance Command, Vietnam CP Command Post CS Designation for tear gas DASC Direct Air Support Center D-Day Day scheduled for the commencement of an operation. DIA IntBul Defense Intelligence Agency Intelligence Bulletin DMZ Demilitarized Zone