For every batch of troops, you have to find the proper motivation!
One thing they used to tell us during Basic Training all the time was “Motivation, motivation!” We all had to find something to motivate us, no matter what or no matter the circumstances. Does it really matter, the details of that motivation, so long as it works? Nope– you fund your happy center and let it drive you.
Some may think I’m pandering to the “women and shoes” stereotypes, but have you ever marched for miles in regular-issue combat boots? Trust me, you need padded insoles, and sometimes you even stack a couple of insoles into your boots. Why would the enemy take that away from us? Who knows– the threat of it is enough to get the trainees “en point” as far as target acquisition.