A Well Regulated Militia:
In light of the discussion between Eugene and Orin, I though I would link to an essay I wrote for National Review Online on September 18th, 2001, Saved by the Militia: Arming an army against terrorism. After noting that it was the members of the general militia that prevented United Flight 93 from reaching its intended target on 9/11, the essay continues (with emphasis in bold I am adding now):
Ask yourself every time you hear a proposal for increased "security": Would have in any way have averted the disaster that actually happened? Will it avert a future suicide attack on the public by other new and different means? Any realistic response to what happened and is likely to happen in the future must acknowledge that, when the next moment of truth arrives in whatever form, calling 911 will not work. Training our youth to be helpless in the face of an attack, avoiding violence at all costs will not work. There will always be foreign and domestic wolves to prey on the sheep we raise. And the next attack is unlikely to take the same form as the ones we just experienced. We must adopt measures that promise some relief in circumstances we cannot now imagine.

Here is the cold hard fact of the matter that will be evaded and denied but which must never be forgotten in these discussions: Often — whether on an airplane, subway, cruise ship, or in a high school — only self defense by the "unorganized militia" will be available when domestic or foreign terrorists chose their next moment of murder. And here is the public-policy implication of this fact: It would be better if the militia were more prepared to act when it is needed.

If the general militia is now "unorganized" and neutered — if it is not well-regulated — whose fault is it? Article I of the Constitution gives Congress full power "to provide for organizing, arming, and disciplining the Militia." The Second Amendment was included in the Bill of Rights in large part because many feared that Congress would neglect the militia (as it has) and, since Congress could not be forced by any constitutional provision to preserve the militia, the only practical means of ensuring its continued existed was to protect the right of individual militia members to keep and bear their own private arms. Nevertheless, it remains the responsibility of Congress to see to it that the general militia is "well-regulated."
And states too, I should now add. The existence of this enumerated power means that Congress can act to organize the militia if it so chooses.

But is it ludicrous to describe those who brought down United 93 as belonging to the militia? As I noted in the essay, Section 311 of US Code Title 10, entitled, "Militia: composition and classes" in its entirety (with emphases added) defines the militia as follows:
(a) The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32, under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard.

(b) The classes of the militia are —

(1) the organized militia, which consists of the National Guard and the Naval Militia; and

(2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia.
But there is no reason why the general militia must remain unorganized. I also observed,
A well-regulated militia does not require a draft or any compulsory training. Nor, as Alexander Hamilton recognized, need training be universal. "To attempt such a thing which would abridge the mass of labor and industry to so considerable extent, would be unwise," he wrote in Federalist 29, "and the experiment, if made, could not succeed, because it would not long be endured." But Congress has the constitutional power to create training programs in effective self-defense including training in small arms — marksmanship, tactics, and gun safety — for any American citizen who volunteers. Any guess how many millions would take weapons training at government expense or even for a modest fee if generally offered?
Maybe it's time (again) to think "outside the box" — or more accurately inside the box provided by the Constitution.