For Your Own Safety, Please Note!

I received this image in an e-mail, this morning from my nephew. My nephew is serving in one of the branches of our armed forces in Afghanistan. For security reasons, I won't use his real name. I'll call him "Joe." (As in G.I. Joe.) Well, it seems that Joe has inherited a similar sense of humor to that of his "Uncle General Tom." Here's his contribution.....

I am told that these little reminders are posted liberally in the necessary locations.

Any questions?