The power for this one should be obvious

[classicdrogn]

Super-cross-dressing Disguise skill, additional bonus if the subject is female (or just slender/bishounen, or possibly nonhuman) being made to look traditionally masculine, and/or for the purpose of opposing Mongols or WW1/2 Germany, possibly Toujo Sekoi or ZnT's Germania(s)?

I figure Doug's got the original in the suite of super-training-montage power songs, so it needs a twist for the cover. Unless dimensional shenanigans make this version the one he hears first, then finding out the context and using the original might give it the disguise bo9nus effect. I mean, Mulan spent months living cheek-by-jowl in an army training camp and on the march without getting found out despite her pretty poor acting, that's some serious Disguise: MAX bullshit.