They also could have written “limited” but they didn’t. The people at the time widely understood it to refer to a militia attended to, to ensure it efficacious. The regulations they had at the time were there to ensure they were well trained and armed. See the militia acts of 1792 & 1795 or for example or any of the other many acts from the period like 1786 N.H. Laws 409-10, An Act for Forming and . Which provided:
[E]very non-commissioned officer and soldier, both in the alarm list and training band, shall be provided, and have constantly in readiness, a good musket, and a bayonet fitted thereto, with a good scabbard and belt, a worm, priming-wire and brush, a cartridge-box that will hold at least twenty-four rounds, six flints, and a pound of powder, forty leaden balls fitted to his gun, a knap sack, a blanket, and a canteen that will hold one quart.
When they wanted their militias well regulated they meant this.