Some trippy posters in there. My favorite was the one where all of the NSA employees had lock mouths. I was surprised how religious some of these were, beyond just "Merry Christmas, don't forget about security" e.g "Christian ideals created freedom"
To be honest I'm not particularly surprised that there's a religious undercurrent to them. I don't exactly know how to quantify it, but as an outsider that's just sort of how I'd expect US propaganda posters to be. The US has always been particularly outwardly religious, so I guess I sort of expect it to play to those sensibilities when making these.
As other threads / comments explained, this only became a thing during the 50's; before that there was a much stronger separation between church and state.