ufo_officialmanual_02

This photograph shows the inside stamp of “UNIT KB-88 BLDG, 21 KIRTLAND AFB, N.M.X” Building 21 is a real building on Kirtland AFB in 1954 and the postal abbreviation of N.M.X. is correct for the era since it was not until 1963 that NM was used as a two digit postal code.