I have a hc that post beating the crap out of his CO but prior to being demoted back to corporal, wash spent like a week as an ODST drill sergeant as a 'punishment' until the higher ups finished their investigation, and that's the only real experience training others he has going into chorus.

so basically, wash tortured tucker and the combined armies of chorus with the brutal training used to root out the people who couldn't make the cut as an ODST, which only makes the scene where the kids jump grif even funnier than it already is.