(4) For a proposed contract over $68 million or, for DoD, NASA, and the Coast Guard, over $93 million, by the senior procurement executive of the agency designated pursuant to 41 U.S.C. 1702(c) in accordance with agency procedures.This authority is not delegable except in the case of the Under Secretary of Defense for Acquisition, Technology, and Logistics, acting as the senior procurement executive for the Department of Defense.