rear guard
1. The rearmost elements of an advancing or a withdrawing force. It has the following functions: to protect the rear of a column from hostile forces; during the withdrawal, to delay the enemy; during the advance, to keep supply routes open. 2. Security detachment that a moving ground force details to the rear to keep it informed and covered.
Gee, thanks for the doctrine lesson, but SUPPLYING the rear guard is one of two things- you are a supply guy handing out supplies, or you are the force provider.
Sorry about your 2 missed Christmases. I know that seemed like a big deal back then. Double it, add in missed kids' birthdays, and anniversaries and you'll be in the company of most Army guys these days.