Marines from Combat Logistics Battalion-453 watch as an amphibious assault vehicle lowers its rear ramp during a test track run at Production Plant Barstow on Feb.19. The CLB Marines spent the day aboard Marine Corps Logistics Base Barstow learning about the maintenance operations carried out at the plant and received a period of military instruction on rail operations. - Marines from Combat Logistics Battalion-453 watch as an amphibious assault vehicle lowers its rear ramp during a test track run at Production Plant Barstow on Feb.19. The CLB Marines spent the day aboard Marine Corps Logistics Base Barstow learning about the maintenance operations carried out at the plant and received a period of military instruction on rail operations.