It is clearly a SMAW. See post above for details. The SMAW is an Israeli-developed weapon used by the Marine Corps. It has a launcher unit (with a built-in spotting rifle and optical sight)and various self-contained projectiles that lock onto the rear of the launcher unit. (That's the AT-4 looking portion of the picture that is causing some confusion).
The Marine Corps has a replacement program for the SMAW (imaginatively called FOTS - Follow On To SMAW) that, if successful, will provide a fire from enclosure (FFE) capability and provide a thermobaric projectile (blast overpressure like FAE).
Is it reloadable, like an RPG or a self-contained, disposable tube device?