I believe CIA imported cocaine into the US to pay for covert operations in South America, as that is a well known fact. (religion.blogs.cnn.com)
Fuel cells are also inherently quite in operation, allowing for covert operations without noisy exhaust rumbles. (topspeed.com)
Cruise plays Barry Seal, «a hustler and pilot unexpectedly recruited by the CIA to run one of the biggest covert operations in U.S. history.» (awardscircuit.com)