As good as the US military's special-operations forces are, they can't do everything.

US special operators often rely on other forces for support and to carry out missions — these 6 are the cream of the foreign crop.

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The US has some of the best special operations units in the world, but they can't do everything on their own. The American military relies on allied special operators from places like Britain, Iraq, and Israel to collect intelligence and kill enemy insurgents and soldiers. Here are 6 of those special operations commands.

A quick note on the photos: Many allied militaries are even more loathe to show the faces of their special operators than the U.S. The photos we've used here are, according to the photographers, of the discussed special operations forces, but we cannot independently verify that the individuals photographed are actually members of the respective clandestine force.