Gentlemen, a couple of points, if I may... Please consider your audience, many of us here are north of 60 years, and though I'm not as old a dinosaur, I've been called one and feel like one on some mornings. In hand with the age issue, is the consideration of offensive tactics versus defensive tactics. Johny posted a link to an article by Mosby regarding using older folks as auxiliary, which is one use of people that can no longer run and gun.
So....how do tactics apply to us that can still pull a trigger and are still capable of hiking 10-12 miles with a 50 lb. backpack, but can't run a 1/4 mile in 45 seconds?