As far as 1 person running the tank... typically you need 2 people just to drive the tank (driver and a TC). But it IS possible to go with just one (driver obviously) but navigating can be difficult w/o a TC. I'm our track driver for our section at my unit so I've got a little bit of knowledge on the matter. Plus we're a Armored Recon unit so if I really wanted to I could go ask one of the Bradley operators how realistic (or unrealistic) that scene was, but I'm pretty sure I already know. As far as operating the cannon... if the tank is stationary it's possible either the driver or TC can climb down and fire it. But if there's only 1 person in the tank (driver) then it simply cannot be fired while being driven.