To be clear... they climbed back on the boat after the strike and were communicating with others to salvage the drugs.
Drug smuggling is not a capital offense.
Drug smuggling is not a military action.
The initial strike was not legal. The second strike, in even your reasoning here (communicating with others to "salvage the drugs") was also illegal - and murder ... not just murder, but even if (it's not) it was a military action, a war crime.
Do you have evidence the rest of us do not? ... please tell us how you know there were drugs on the boat, and where said boat was traveling. It would also be nice to know who was on the boat. Has any of this information been released?
The FBI doesn't have to follow illegal orders, either.
Everyone involved in this coverup swore an oath to the Constitution, which does not mention a duty to protect rapists and pedophiles.