No such animal as a former Marine.
My mistake & apologies if I offended anyone.
In many conversations over the years any mention of 'he is a Marine' is always met with where is he serving, what's his MOS and a half dozen other questions implying the asker believes he is active duty.
He served his country proudly, now is a mechanical engineer when asked by those not familiar with military service/life he refers to himself as former to avoid 12 dozen questions.
As he would say, BIOYA.