Practice Rocket for the 3.5" Rocket Launcher as used by Canadian Army into the 1970s. INERT Dated 6-54 (June 1954) "ROCKET PRAC. 3.5" - BLUE The M20 3.5" Rocket Launcher "Super Bazooka" gave the foot soldier a portable anti-tank weapon, as well as a super bunker-clearer. Weighing only 12 pounds, it fired a shaped charge which concentrated the rocket's energy in a small area, and was effective against up to eleven inches of armor at a range of almost 900 yards.