c. late 1960s-early 1970s. Each is stiff paper. Sizes range from 16x21" to 17x21". First is likely for Apollo 10 and has image of Snoopy wearing space helmet standing on tower holding "Flight Safety" case as rockets blast into air with text at left "Up Up & Away Good Work...Is The Only Way! Keep Apollo The Symbol Of Excellence". Copyright Snoopy, From Peanuts United Features Syndicate 1968. Second poster has image of two male and one female astronaut in uniforms waving as Santa and his sled fly around in bkg. with text at top "Seasons Greetings...To The Apollo Team". Bottom half of poster have facsimile signatures of 48+ people including Neil Armstrong, James Lovell, Jim Irwin, Micheal Collins, Wally Schirra, Edwin E. Aldrin Jr. Text at bottom "Manned Flight Awareness" with NASA logo. Third poster has art image of astronaut Alan B. Shepard Jr. and lunar module with text "Where Quality Counts Manned Flight Awareness NASA Manned Space Craft Center" with Houston, Texas designation at lower right corner. A few lt. handling creases here and there. Second poster has .25x1" moisture mark at lower left corner tip and third poster has two tiny tears at bottom blank margin edge. Overall group is Fine/VF. Nicely designed group with extremely limited distribution, just for in-house NASA operations.