No need to waste taxpayer money to “investigate” next time. Fox News reports,

Highly sensitive U.S. military equipment stored in Libya was stolen over the summer by groups likely aligned and working with terrorist organizations, State Department sources told Fox News — in raids that contributed to the decision to pull Special Forces personnel from the country.
The stolen equipment had been used by U.S. Special Forces stationed in the country. Lost in the raids in late July and early August were dozens of M4 rifles, night-vision technology and lasers used as aiming devices that are mounted on guns and can only be seen with night-vision equipment.
. . .
The raids and stolen equipment quickly caused a rift among U.S. Special Forces, Libyan military leaders and ultimately the U.S. State Department.
“They didn’t want anything to go wrong and they didn’t want to take the blame. Sensitive items were taken,” one source said. “Bad guys can now shoot people at night with no signature.”