How come rocket launchers/rpg’s can only be fired once?

Question

I saw video about rocket launchers like javelins and rpgs that said they can only be fired once, why so?

In: Technology

Answer 1

Single use weapon systems can be made from light materials like glass fiber, to bring the weight down. Single use LAW M72 weight around 3kg, where multiple use RPG-7 weights 8kg.
Firing an RPG or Anti-tank missile will give away shooters position easily due loud noise and smoke. So it’s nessessary to be able to discard weapon and relocate quickly.
Javelin is separate launcher/sighting system with anti-tank missile that’s in single use launching tube.