We don't know the exact location, but it's at least 12 nautical miles out, 13.8 regular ones.
If Michael Phelps had a baby with Janet Evans, that prodigy is still likely fucked.
13.8 miles in a pool is doable, but 13.8 miles of open ocean are a whole different thing, and its going to be a lot more than 13.8 miles with the water moving you around. That's if they even knew which direction was land and managed to swim directly at it. Even a minor orientation error drastically increases the distance.
Even if they could cling to the wreckage, or survival float long enough, they'd be completely at the mercy of the currents. Lifejackets would improve these odds, but still would leave plenty of time to detain them.
Even if you strain credulity hard enough to think that there's a minuscule chance the above might happen, it's still illegal to kill them.
Such an excuse would be ludicrous from a general who has never left the land, but Bradley is a SEAL.