According to various press reports one of the SEALs, Glenn “Bub” Doherty, had been interviewed a few months ago by ABC News and indicated he and his team were in Libya to track down and destroy several thousand MANPADS (MAN Portable Air Defense System: Portable surface to air missiles) which had disappeared since the Ghadaffi regieme had fallen. I presume the other former SEAL killed, Tyrone “Rone” Woods, was also part of the team Doherty referred to; although that is not clear.
That fits Beck’s hypothesis.