"Miss Manners" for the military, Oretha Swartz provides up-to-date information in her classic etiquette book that has served generations of officers in all branches of the armed forces. Called "The Bible" throughout the services, it is considered the ultimate authority for social occasions at home or abroad and remains the first and last source to consult to settle problems of protocol.
Etiquette and manners are not just empty acts for show. Civility is in decline as we tailspin further and further into the vortex of technology, minimizing human contact and reverence. When approached with meaning and intention, etiquette can be an act of conscientiousness and caring for those we encounter...something I hope to promote, preserve, and pass on.
This appears to be the definitive/official edition (the fifth), and extends beyond military to government employees and other professionals...no doubt useful for civilians of any kind.