What on earth has "officer and gentleman" behaviour got to to do with telling the truth. If (and I know nothing of the circs so I repeat if) this officer lied he should certainly be up before a court martial. But then so should an SAC who had omitted some essential bit of servicing and caused a major incident then lied about it. Integrity has nothing to do with being an "officer and a gentleman" (or indeed a lady as we now have female aircrew). It is required from all ranks