 After an hour on the ground , the helicopters left with the first 61 <unk> , including all American civilians and four heads of mission . <unk> were provided blankets on one of the flights to remain warm . <unk> with the only in @-@ flight <unk> on the return nearly prevented <unk> , which would have forced the helicopters to divert to the Somali desert and await a rescue . At 9 : 40 , the helicopters arrived on Guam and <unk> the <unk> . 
