I met a nice older gentleman the other night, WWII and Korean War vet, who had a bifurcated thumb. It looked natural but may not have been, I guess. It was both interesting and slightly squicky to see. The two halves could open and close horizontally, as he demonstrated when he held out his hand and picked up his daughter’s DL with the finger(s), and when I put my finger between he squeezed it quite tightly, leading me to exclaim “The Claw!” and making him laugh.
Anyway my question is, if it was a birth “deformity” wouldn’t that somehow make him ineligible for military service, similarly as if he was missing a finger? Can’t fit standard equipment, or somesuch? I’m not suggesting that he should have been, mind you, I’m just curious if he could have been refused.