is a variation on the system that allows both guns to be trained forward and remotely fired by the pilot using the M60 series of reflex sights. The USAF was the primary user of this system and often combined it with two 7-Tube 2.75" rocket launchers of varying types on two independent support rack and pylon assemblies. XM94 A variant of the XM93, the XM94 substitutes the M129 40mm grenade launcher for one or both of the door mounted M134 7.62×51mm Miniguns. XM156/M156 Not technically an armament subsystem, the XM156/M156 universal mount provided mounting supports and racks for a number of systems used on the UH-1 series of helicopters. A/A49E-3 Similar to the US Army XM93, this system type classified by the Air Force uses mounts similar to those used in the M23 system mounting two M134 7.62×51mm Miniguns at each of the main cabin doors of the UH-1N helicopters. This system is likely suitable for other long-fuselage UH-1 types. A/A49E-11 Referred to as the Defensive Armament System or DAS, this system is composed of two mounts for GAU-15/A and GAU-16/A .50 caliber machine guns or GAU-17/A 7.62×51mm Miniguns, as well as, two BRU-20/A or BRU-21/A bomb racks for current 2.75" rocket launchers. This system was also designed primarily for use with the UH-1N helicopter (and is in use with the US Marine Corps as well in this capacity), but is likely suitable for other long-fuselage UH-1 types. TK-2 A variant of the TK-1 for the CH-34/UH-34 helicopter, the TK-2 (Temporary Kit-2) was developed by the USMC for their UH-1E helicopter. The system provides the same four M60C 7.62×51mm machine guns as the TK-1, but adds two independent support rack and pylon assemblies to the system, for mounting an acceptable aircraft style armament. Typically these mounts were used for 7-Tube 2.75" rocket launchers of varying types, but were also seen tested with XM18/M18 Minigun pods (USAF SUU-11/A). Emerson TAT-101 Unique to USMC UH-1E helicopters between April 1967 and 1972 was the use of the Emerson Electric TAT-101 (Tactical Armament Turret-101) nose turret. The turret housed two M60 machine guns with 1000 rounds total, and had 100 degrees in azimuth left or right, plus 15 degrees of elevation and 45 degrees of depression. The slew-rate on the turret was 45 degrees per second. Jamming and the need for maintenance led to the turret's front fairing being left off to assist ground