I was going to go with mjr_malfunction at first, because 1) Sgt. Hartman says it in Full Metal Jacket and 2) Soldier is crazy, but then I thought that Major was too high of a rank so I bumped him down to Sergeant. And crockets is the shortened form of crit rocket, which are a Soldiers best attack.

feeltheraeg just comes from Kilo Monster being a monster of rage and misspelling things is the cool thing to do.

vespa_americana is supposed to be a scientific name for Solly. Vespa is the genus for hornets. Americana is the species name, so it comes out to be American Hornet.