In Yemen, we are backing Saudi Arabia against the Iranian-supported side of the conflict by using drone attacks on their enemies and on the US citizens and other jihadists there who Obama has 'declared' to be subject to the death penalty for attacks by the 'shoe bomber' and the FedEx bomb attempts.  Some of the drone attacks are run by the CIA and some by the military.   Any 'troops on the ground' in Yemen would likely be laser designators for 'smart' weapons attacks.  

None are subject to any oversight by anyone except by specified congressional committees who are not permitted to reveal 'sources and methods'.