It would be hard not to when you can type in amounts and get instant feedback on what you would make. I imagine him sitting there, typing in $1000 and seeing $3000 payout. Then thinking "What if I just took my $32,000 savings and put it on this bet?". Type that in, see $400k and think "I can't not do this!"
Special forces in America are somewhat famous at this point for having side hustles.. Betting on themselves like this is at least better than being murderous drug dealers: https://en.wikipedia.org/wiki/The_Fort_Bragg_Cartel
Not that I am endorsing the behavior, but it is not a given how many high profile operations the soldier might glean in a time relevant manner. That might have been the one shot, one opportunity to hit big.