These were distributed in 1962 for the Shelter Marking Program. The two fallout shelter signs are the FS1 which is a 14 x 20 inch aluminum sign and the FS2 which is a 10 x 14 inch galvanized steel sign. Both have “Not To Be Reproduced Or Used Without Department Of Defense Permission.” at the bottom of the sign. The 14 x 20 were to be put on the outside of a building while the 10 x 14 were placed on the inside to direct people to the Fallout Shelter. The signs also came with stickers of numbers, capacity, arrows, and instructions that would be placed on the sign.