I play on the pc and can bring up the commands to spot enemies, call for ammo, etc but my son plays on the PS3 and we can't figure out how to do those same actions. Anyone got an answer?
What you're referring to is called commo rose and is brought up on PC using Q button. Back button on X360 and Select button PS3 have same role, but as of now it's only limited to spotting (which also works as a single context dependent command, for example spotting friendly support will ask him for ammo).
“no plans to add it on consoles where other automated systems are in place.”
The DualShock3's SELECT button is what you need... It's the only SPOT/Communication button... If you press SELECT looking to the enemy, it will SPOT... If the teammate is playing as Support guy, look him and press SELECT then you'll ask him for ammo... If Engineer and look for a damaged tank, press SELECT then you'll offer repair, etc.etc.etc... The situation changes the function of the button...