Via the editor place an (BLUFOR) AT soldier grouped with player and 5 (OPFOR) armored cars in his vision no further than 500 meters from him. Also place an Launchers Ammo box close by him.
He will fire his 3 PCML missiles at the armored cars. When the player selects him and via menu 6 orders him to rearm at launchers he will only get 1 (one) PCML missile.
Do the same for the AT specialist unit class, but instead of armored cars use OPFOR tanks an place them further away (around 500 - 1000 meters).