conduct 'unbecoming' an officer [=conduct/behavior that is not appropriate for an officer]
behavior 'unbecoming of/to' a public official
That color is very 'unbecoming' on her.
(..) Specifically that you were... "seen in public venues with another female officer at a time and manner... as to suggest conduct unbecoming an officer. " Sir, is someone suggesting that I'm a lesbian? We're not asking if you are, Lieutenant, and you're not required (..)1997 G.I. Jane
(..) a separate head. If you have any special medical needs, inform the infirmary. If your classmates or a superior acts in a harassing... or otherwise unbecoming manner, you are to inform me immediately, so that I can deal with it immediately. It may not always run smooth, (..)1997 G.I. Jane