UPDATE, Feb. 10, 2016, 9:30 a.m.: Based on serial numbers visible on the tail fins, readers have deduced that the crashed aircraft in the sixth photo is AJ 310, piloted by Lt. Stephen Owen Musselman, which was downed near Hanoi on Sept. 10, 1972.For much of the world, the visual history of the Vietnam War has been defined by a handful of iconic photographs: Eddie Adams’ image of a Viet Cong fighte