Another robot - base guardian (Air Force!).

Originally posted by Odium
If you think, at any one point they have two guards at one gate/check point, they work on eitehr 6 or 8 hour shifts. (Peace/War time) so, for $50,000 a piece on training, that's already $400,000 (8*50,000) then you have to factor in pay over X amount of years.

You will still need at least 3-4 operators (because this thing doesn't have superior AI). Plus the machines are breaking, the computer chips can burn etc. You will need much money to repair and maintain it.
But I agree some armored robotic guards could be used in hot zones like Sunni triangle..