The current 5-inch Zuni rockets use the MK 71 motor. It uses a smoke-less propellant and has a completely new nozzle/fin assembly. The latter has four wrap-around type fins, and therefore the MK 71 is sometimes called a WAFAR (Wrap-Around Fin Aerial Rocket) instead of an FFAR. The actual diameter of the MK 71 is quoted as 130 mm (5.12 in). The MK 71 MOD 0 began to replace the MK 16 in June 1971, but was soon superseded by the MK 71 MOD 1, which entered full production in September 1973. The MK 71 MOD 1 is the only Zuni motor currently in use, and is a HERO (Hazards of Electromagnetic Radiation to Ordnance) safe modification of the MOD 0. The MK 71 rockets are fired from LAU-10C/A and LAU-10D/A 4-tube pods, the earlier launcher versions (through LAU-10B/A) being incompatible with the new motor. The LAU-10C/A is for shore-based use only, because it lacks the thermal protection coating of the -10D/A