As others have noted, this was an odd mix of RTS and business sim. You were fighting on two fronts, on the battle field and in the board room. As the head of a PMC, you were responsible for getting contracts, getting your army together, deploying it to the target location, achieving the objectives, then go back, make sure you had the proper finance to keep going, bet on the stock market, outright buy your opponents (apart from a particular one), and invest in research of new units. I remember War Inc offering a large variety of unit types, from fairly normal military equipment to terminators, and they were all customizable, within the budget you had available. It made for some very harrowing battles when fielding really expensive prototypes that you could not really afford to lose. But who can resist the siren's call of shoving a lot of firepower onto a helicopter, and hoping the enemy doesn't have surface to air capabilities?
I haven't really seen many RTS games go in this particular direction, at least not ones that have been on my radar. Which is odd, because War Inc did everything quite well. Sure, maybe it's not an RTS to the standard of Starcraft or C&C, but you have a much larger say in what your units are and how battles flow. If you fielded a large enough battle force from your HQ, you could even skip the base building aspect in some situations. A refined version of the idea would be most welcome. Lacking that, it would sure be nice if the original was still available for people to buy and run on modern systems.