No rearming in CFS2. If you really want to "simulate" some sort of rearming, just set unlimited ammo in settings and add any type of weapons counter gauge to the panel. When the counter reaches zero weapons, fly back to your carrier, land and then take off again to the target and start a new attack. Even though you have unlimited ammo, the counter is just to let you know when to return to the carrier and start the "rearming" simulation.