That oath remains in effect for every one of us who swore it. At no point did anyone ever say, “Go in peace; your oath is fulfilled.”
We may be old and fat and tired, but we are still sworn. All we need is a commander we can believe it.
Is Allen West available?
Those of us who are old have experience and judgement, a good trade for the energy of youth.
Those of us who are fat and tired have a little time to get in shape, at least somewhat. We can get to where we can walk a mile, or a 5k. Or if we're already there, we can get to where we can run a mile or 5k, or do it faster. We can get range time - just 100 rounds of anything twice a week, and 100 pellets a day each with air pistol and air rifle, to remember those skills. If nothing happens, it will still be worth while, and fun. If America's enemies take this to the next level, that fitness will come in handy.
As for a commander we can believe in, that is the toughest part of all. We need to be careful in that area, very careful. Remember, of course, that like all decent Americans, our goal should be to preserve, protect, and defend the Constitution of the United States.