I know this varied by base but one area that AMF used to really score an F in was MX. Chieftains and 99s were really bad. The culture in BUR made it so bad that they would go through mechanics pretty frequently (again if they weren't oddballs of felons, yes we had both lol) and one thing that was echoed was preventative MX. At least on the west coast, preventative MX was not going to happen. Hell, when I was there they would suspend you if left and airplane at the end of the day, and the next guy in the morning had a preflight issue. Even for the nav bulb really did burn out as soon as it was flipped on in the morning. Getting them to change anything before it broke, stopped working, cracked, caught fire, leaked or exploded was really hard.