A Navy statement Monday said officials determined the chance of survival was now considered "extremely unlikely" following Sunday's crash.
The MH-60S Knighthawk went down in the central Red Sea while operating with the destroyer USS William P. Lawrence.
The names of the missing airmen were not immediately released.
The Bahrain-based 5th Fleet says aircraft and vessels took part in the search. It said the crash was under investigation, but no hostile action was involved.
More Nation & World Headlines
U.S. suspends personnel over botched Afghan attack Russia sends air-defense missiles to Turkey Why the media won't say Donald Trump is lying Casey Kasem’s widow sued for wrongful death Yet another study debunks the global warming ‘pause’ More than 400 will die on roads this weekend Can a five-hour Alaskan train ride be compelling Thanksgiving viewing? So, a turkey wants into a church ...
Our new comment system is not supported in IE 7. Please upgrade your browser here.