Located on the main highway, QL-19, between Qui Nhon on the coast and Pleiku in the Central Highlands region of Vietnam, An Khe was of strategic significance during the Vietnam War.
Leo (John Spencer) says that the US is still at war with North Korea, "we haven't signed an armistice." This is wrong: an armistice is merely an agreement to end hostilities for the time being - like the Korean Armistice Agreement signed in 1953. Leo means that we haven't signed a peace treaty.
Leo (John Spencer) explains to the president that the Navy SEALs will be jumping from an altitude of 40,000 feet. However, the SEALs are seen on the video in the Situation Room jumping out of the airplane without oxygen masks, which would be necessary at that altitude.
The aircraft flown by Leo during the war was a Republic F-105 Thunderchief. This was a 2-seater attack fighter in service during the Vietnam war and referenced by Leo in the season 3 episode "War Crimes" and Season 4 episode "Red Haven's on Fire". In 2-seater aircraft, both civilian and military, both crew members are said to "fly the plane" whether they are the primary pilot or not. In both scenarios, should the primary Pilot become incapacitated, the co-pilot/navigator/Rio/weapons officer is qualified and capable of piloting the aircraft. So Leo stating that he "flew F-105s in the war in Vietnam" was technically accurate.