U.S. MARINE ROCKET ARTILLERY EXERCISE AT 29 PALMS: A Marine unit fires an M142 High-Mobility Artillery Rocket System — HIMARS in the lingo. The HIMARS is a cheaper and lighter version of the original MLRS (Multiple Launch Rocket System).
And speaking of lingo: you can pre-order the second edition of Embrace The Suck at Amazon. The new cover is perfect.