Burning down my hooch with 1 day of Survival left.
Losing my map (dummy cord pulled out) on Land Nav, going back and finding it, and running so fast to the next checkpoint my ruck messed up my kidneys so bad I pissed blood and had to go to the TMC for a needless finger wave.
Getting a "No-Go" on my first mission in Patrolling because I set up a dangerous support field of fire, then basically having to do nothing on my subsequent Recon mission because my buddies did it all for me.
Gaining weight during Patrolling and getting the nickname "Earth Pig".