Obviously aptitude and leadership are paramount. Bear in mind you could be the BENGO on a shift on the largest Sqn in the RAF operating vintage aircraft and commanding up to 70 hairy ar$ed engineers who are probably older and many more qualified than you.
The ability to listen to your experienced seniors, even if you dont use their advice, and then make a balanced (and maybe unpopular) decision is of utter importance. However this does not help you in your interviews!
My advice from the enlisted scums perspective is: Be yourself, think of the 'team' especially their welfare and most of all dont dither
A positive and approachable attitude is well respected by us oily ticks.
Oh and remember the GE is always right and can easily save your ass