How would you interpret ‘void coupon’ in this letter? Dear Shepherd, What’s steamin, demon? Remember me, from civilian service? (Nobody forgets this Tom-cat.) Hope you’re all the aces since last we soldiered together for Art and Country. Everywhere I go now, some guy is just home from Europe telling how he dodged the lead pill or brought in his bomber on a wing and a prayer. Does anybody want to hear a hair-raising tale of Army SNAFU in the National Gallery? You and me buddy, a couple of Civvy cream puffs, it’s a void coupon ain’t it? If only my old chum Shepherd were here, we could tell some war stories, sure. How you and I drank so much joe on the train, we almost dropped a marble Rodin on its head in the Asheville station. How would you interpret ‘void coupon’ in this letter? Thanks!