I've been friends two former Navy UDT team members (precursor to the SEALs), both of whom were Korean war vets, and one former SEAL. One was an old girlfriend's dad and the kind of person you describe--unassuming, very decent family guy who I liked a lot. I had no idea he'd even been in the military, much less done insane things deep in North Korean territory, until I asked his daughter how he'd come to start a diving services company.

The other former UDT vet was my high school writing teacher, a sort of Yoda figure. He covered the clock in his classroom with a picture of the Buddha, so you got a little jolt of patience training every time you snuck a glance at the clock. Whatever small writing talent I have started with him.

Third was a friend's cousin who who'd left the service in his mid-thirties. For a while we were drinking buddies. We road bikes together for a while too, but that didn't last long--he was in such phenomenally better shape than me, despite training half as much, it was a mismatch. We were a mismatch in general--he was a bro's bro and I was like his token hippie friend. But we had fun boozing around for a while, and he was in no way damaged goods.

Speaking of booze, one amazing thing about Sadler was his ability to write so many potboilers while drinking so hard. I don't drink anymore, in large part because my productivity just went to shit when I was drunk all the time. Maybe it's more feasible to write purple prose than code when you're loaded.