The Beech SNB is a US Navy/Marine variant of the civilian Model 18 Twin Beech. Over half of the 10,000 produced from 1937 and 1970 were for to the US Military. Military variants include C-45, AT-7, AT-11, SNB, F-2, and JRB. Uses included light transport, photo-reconnaissance, and navigation, bombing, and gunnery training.
 
Many Twin Beech aircraft survive today after serving post-military as relative inexpensive, reliable light cargo aircraft. N4207 was manufactured by Beech in Wichita, Kansas, 1943 as a Navy/Marine SNB-2, BuNos 67124 (c/n 4664). In 1954 it was remanufactured by Beech and redesignated by the Navy to a model SNB-5P, a photo reconnaissance trainer. In 1962 the Navy redesignated it to a model RC-45J. N4207 was stationed at NAS/MCAS Kaneohe Bay, Hawaii and NAS Pensacola, Florida, both stations being aviation training facilities since before WWII.
 
N4207 was acquired by the Mississippi Wing CAF in 1983, restored to flying condition by 1995, assigned to the Utah Wing CAF, and re-assigned to the Indiana Wing in 2014.