Many war films have been produced with the cooperation of a nation's military forces. The United States Navy has been very cooperative since World War II in providing ships and technical guidance, Top Gun being the most famous example.
Over the weekend, my wife sent me out to get her some medicine because our entire family got hit with a bad cold. When I went to the drug store, the cashier behind the counter asked if I wanted to donate some M&M's to the Troops which I gladly gave. I found out that online M&M's has been doing this since 1941 as a treat while they're at war.