The M1114 HMMWV Interim Fragment (Frag) Kit 5 was an add-on armor for doors of the M1114 HMMWV. It consisted of four bolt-on doors that provided another layer of metal over the previously established factory-built armor, and was initially deployed in the field in April 2006. The doors provided another layer of metal over the previously established factory-built armor. This kit was designed and tested by the U.S. Army Research Laboratory at Aberdeen Proving Ground, MD.