Mortar, 4.2-inch U. S.-built, 107mm, rifled, muzzle-loaded, M98 Howtar mortar; a towed weapon, the Howtar is mounted on a carriage with two pneumatic tires. Tube and carriage weigh 1,289 pounds; maximum range is 5,500 meters. (Two Howtars were employed at KSCB) M-16 U. S.-built, magazine-fed, 5.62mm gas-operated, air-cooled shoulder weapon designed for either semiautomatic or full automatic fire; fully loaded weighs 7.6 pounds, fires a maximum rate of 150-200 rounds per minute, and has a maximum effective range of 460 meters. 9th MAB 9th Marine Amphibious Brigade 9th MEB 9th Marine Expeditionary Brigade NVA North Vietnamese Army O1-E U. S.-built, single engine, two-seat, prop-driven light observation aircraft built by Cessna. Ontos U. S.-built, lightly-armored tracked vehicle armed with six coaxially mounted 106mm recoilless rifles. Originally designed as a tank killer, the Ontos is primarily used in Vietnam to support the infantry. PCV Provisional Corps, Vietnam PF Popular Forces PMDL Provisional Military Demarcation Line RC-292 U. S.-built, elevated, wide-band, modified ground-plane antenna designed to operate with and increase the distance range of various radio sets. Recoilless Rifle, U. S.-built, single-shot, recoilless, 106mm, M40A1 breech-loaded weapon which weighs 438 pounds when assembled and mounted for firing; it has a sustained rate of fire of 6 rounds per minute and an effective range of 1,365 meters. The weapon can be singly or Ontos mounted. RF Regional Forces RLT Regimental Landing Team Rocket, 122mm A Soviet-built, four-piece, fin-stabilized, 9-foot long rocket weighing 125 pounds; maximum range is approximately 17,000 meters. Launcher tube and mount weigh 121 pounds and are 8.1 feet in length.