Since June, the U.S. military has been slowly stockpiling massive amounts of its gear coming out of Afghanistan at a depot in Kuwait adjacent to a bustling commercial port, in preparation for ultimately shipping it across the border into Iraq for an allied offensive against the Islamic State group.

The facility’s warehouses and large asphalt yards now are home to roughly 3,100 vehicles, most of them MRAPs – the mine-resistant, ambush-protected vehicles that have been ubiquitous in America’s prolonged wars in Iraq and Afghanistan. There is also some electronic equipment and other supplies at the depot, located at Kuwait’s Shuaiba port, defense officials say.

The gear, primarily from the Army, will be fixed up and held as top U.S. planners in Iraq determine what they’ll need to defeat the Islamic State group in the coming months, says Air Force Maj. Gen. Rowayne “Wayne” Schatz, the director of operations and plans for U.S. Transportation Command. […]