The Probert Encyclopaedia of Warfare

XLIM-49A

The XLIM-49A (Nike Zeus) was an American Anti-Ballistic-Missile missile first deployed in 1965, and retired in 1969. It was armed with a W-31 20kT nuclear warhead and had a range of 250 km.
Research XLIM-49A

XM2 30E1

The Hughes XM2 30E1 is an American single-barrel, externally powered 30 mm chain gun designed for mounting on helicopters. The XM2 30E1 has a rate of fire of 750 rounds per minute.
Research XM2 30E1

XM242

The Hughes XM242 is an American 25 mm dual feed automatic cannon developed during the 1970's derived from the Hughes XM2 30E1 chain gun, and designed for use on light AFVs. The XM242 has a selectable rate of fire of single shot or between 100 and 200 rounds per minute.
Research XM242