To anyone who's going to read the comments: Just hug the BMP-1. Arming distance exists in Squad for certain projectiles like rockets, missiles (both from emplacements and vehicles), grenades from grenade launchers, and in this case, the 73mm projectiles fired by the BMP-1 and SPG-9 recoilless gun. Meaning said projectiles need to travel a certain distance before being allowed to explode on impact with a target. Since 2 of the 3 weapons on the BMP-1 are affected by arming distance, it is effectively defenseless against any armored vehicle that is close to it. The coaxial machine gun cannot damage armored vehicles.
