I use a fired shell from an M1A1 main gun for my cigar time at the lake.
It's cool because I kept it from driver/loader training at 29 Palms when I was with 2nd Tank BN.
I wish it was a round I fired, but, as a TOW gunner, I just got a quick familiarization course before we went to KSA and didn't get to shoot anything.
Gitsum.
And Happy Thanksgiving.