Master Sgt. Timothy Greenleaf, logistics chief, explains the warehousing operations in the bulk storage area of the MCI warehouse at the Washington Navy Yard in Washington, D.C., Jan 6. Textbooks for professional military education are maintained separately in this aisle to allow the warehouse clerks to easily assemble and process multiple books, which are shipped out as part of a series. - Master Sgt. Timothy Greenleaf, logistics chief, explains the warehousing operations in the bulk storage area of the MCI warehouse at the Washington Navy Yard in Washington, D.C., Jan 6. Textbooks for professional military education are maintained separately in this aisle to allow the warehouse clerks to easily assemble and process multiple books, which are shipped out as part of a series.