Another part of my 'Hydra 70' project.
LAU-68D/A is 7-Tube Rocket Launcher with external thermal protection coating used by US Navy and US Marine Corps.
LAU-131/A is the same construction but without thermal protection and used by US Air Force.
Link for purchase:
https://www.cgtrader.com/3d-models/military/rocketry/lau-68-lau-131-rockert-launchers-for-hydra-70