Whose Blue Yonder Is This, Anyway?Author:Tom RicksPublish date:Oct 1, 2018 7:30 AM EDTA U.S. Air force F-15D Eagle Flies above the Mariana Islands in support of exercise Valiant Shield 18, Sept. 18, 2018. Valiant Shield is a U.S.-only, biennial field training exercise (FTX) with a focus on integration of joint training among U.S. forces in relation to current operational plans. This training enables real-world proficiency in sustaining joint forces through detecting, locating, tracking and engaging units at sea, in the air, on land, and in cyberspace in response to a range of mission areas.U.S. Air Force/Senior Airman Zachary BumpusIs the F-15 allowed to fly over the ocean? I thought that was owned by the Navy.