[68skylark]

A female and/or SEX are involved in some manner.

My speculation is going in the same direction as yours -- it's either that or alcohol.

[leadpenny]

I worked at Army Selection Boards many years ago. Nine times out of ten
career enders are associated with booze and/or p-tang (or it's equivalent). The rest seemed to have to do with money, but even in those cases they may have stemmed from what got the others.