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.
(..) - See you when I get back from Cuba. - Say hi to Castro for me. Will do. What are we looking at? They plead guilty, we drop the conspiracy and conduct unbecoming. - Twenty years. They're home in half. - I want . - Can't do it. - They called the ambulance. I don't care if they called (..)1992 A Few Good Men
(..) embarrass the Security Council guy? - Colonel Jessup. - Twelve years. Sorry? I'll get them to drop the conspiracy and conduct unbecoming. Twelve years. You haven't talked to a witness or looked at a piece of paper. Pretty impressive, huh? You're gonna have (..)1992 A Few Good Men