mounts were fabricated for use with early UH-1s as well. UH-34/CH-34 Choctaw/Seahorse XM4 Described simply as a "2.75-inch rocket launcher subsystem for the CH-34," there is no information as to how many rockets the XM4 was capable of launching. XM6E1 For more information on the M6 Series see the UH-1 entry in this article. The XM6E1 was a variation of the XM6 for use with the CH-34 helicopter. TK-1 A USMC weapon system to provide H-34 helicopters with offensive armament, the TK-1 (Temporary Kit-1) featured two M60C 7.62×51mm machine guns, fixed forward on the right side of the aircraft, with ammunition fed out from boxes inside the aircraft. Also attached to these assemblies were two pylons, fitted with 19-shot 2.75-inch rocket launchers. Aircraft equipped with the TK-1 were sometimes referred to as "Stingers." AGM-12 Bullpup The H-34 could carry the AGM-12 Bullpup for precision guided attacks on ground targets. Due to simple nature of the Bullpup, it could be mounted on many platforms, and the H-34 was one of them. Defensive Armament Both the US Army and the USMC developed pintle mounts for use in the main cargo door and opposite window, mounting a single infantry type M60 7.62×51mm machine gun (sometimes referred to as "M60A"), allowing the crew chief to fire the weapon while seated on the opposite side. The USMC tested mounting the heavier M2 machine gun, but found the vibration when firing to be detrimental to the aircraft. In all the mounts were imperfect as they blocked easy entry and exit from the main cabin. CH-46 Sea Knight Defensive Armament The CH-46E Sea Knight has the ability to mount the XM-218 .50 caliber heavy machine gun. On the left side of the helicopter it is mounted in the AO's (Aerial Observer) window just behind the copilots seat. On the right side it is mounted in the Gunner's window just behind the crew door. The aircraft is also set up to carry a RMWS (Ramp Mounted Weapon System) which holds the M240D 7.62mm medium machine gun. XM-218 The XM-218, 0.50 caliber aircraft machine gun is a belt-fed, recoil-operated, air-cooled, alternate-feed weapon fired from the closed bolt position. It is capable of firing at a rapid rate of 750-850 rounds per minute. M240D The M240D machine gun is a belt-fed, gas-operated, air-cooled, alternate-feed automatic weapon fired from the open bolt position. It has a rate of fire of 650-950