I would caution a lot of folks about the early MJTAS volumes:
A bunch of the material in many of the articles has been superseded by later Mongoose rules. Also, almost none of the material are 'official rules', they're options, alternatives, and IMTU variants.
All this is fine, btw. The original JTAS was the exact same thing. Things in JTAS 3 was superseded by the official rules in Mercenary, High Guard, and Scouts later on. The JTAS volumes were and are intended to give players and refs other options to follow and other voices to be heard.