If I understand the OP, he is playing a merc unit . . . where most people need to wear a second hat because you either cannot always find someone with the requisite skills or afford to pay them. You also do not have all the fancy set up that House regulars or even planetary militia could have on hand. BUT . . .
They should still have some sort of HQ unit when we are talking company or larger- a reinforced company should definitely have a support platoon if not two as HQ support. It would be the folks tracking ammo & food, in charge of the techs & their parts, general supply & POL, intel, operations and probably a liason though that person is likely a line officer with some diplomatic skills. IMO, the best solution for a Intel officer in a merc unit would be a guy who is also trained as a tanker and whose tank is part of the HQ security element- but that is a secondary skill. The Eagle is absolutely right about training, I used to rub shoulders with the MI types for lots of jokes- usually 'Oh look, the battle against Orangeland for this exercise is on a peninsula going N to S . . . and we are fighting NORTH Orangeland!' Additionally, DURING a battle a intel officer should be looking over the incoming data- for one thing they should be pointing out if the reported units does not match up with the TO&E your are expecting.
Additionally, the XO is traditionally the officer on the staff that oversees training- his job is to hand the CO a finely tuned weapon as the understudy and able to step up into the CO's shoes if something happens.