Military Expeditionary BOSN’ Locker Hatchbox “E” System Rigging and Cargo Handling 20’ MILVAN/CONEX. Rapid Deployable Rigging Gear Locker designed and built to support Military Cargo Handling Mission. MILVAN contains all required rigging components (30 ton spreader bars, slings, shackles, safety gear, tools) for pier, ship and land based loading and unloading mission requirements for rapid deployment.