Personnel Armor System for Ground Troops (PASGT, pronounced ) is a combat helmet and ballistic vest that was used by the United States military from the early 1980s until the mid-2000s, when the helmet and vest were succeeded by the Lightweight Helmet (LWH), Modular Integrated Communications Helmet (MICH), and Interceptor Body Armor (IBA) respectively. Designed in the mid-1970s as a replacement for the M1 helmet and previous fragmentation vests, prototypes of the PASGT were tested in the late 1970s before being fielded in the early 1980s. In the early 2000s, the PASGT vest began being replaced by the IBA and the PASGT helmet was replaced soon thereafter with the LWH and MICH. As of 2018, the only remaining U.S. military users of PASGT in any capacity are the U.S. Army Reserve and the U.S. Navy, the latter of which retains the PASGT helmet for use by sailors aboard its warships, in addition to a PASGT-derived vest known as the "U.S. Navy Flak Jacket". Name PASGT is an acronym, standing for Personnel Armor System for Ground Troops. When used by itself, PASGT refers to both the vest and helmet together. In the U.S. military, the PASGT helmet was most commonly known by its wearers as simply the "Kevlar". The nickname has since been adopted for usage with other helmets. The PASGT helmet was also referred to by its wearers in the U.S. military as the "K-pot", similar in name to the colloquial nickname "steel pot" for the steel M1 helmet, which was in widespread U.S. military usage from the 1940s, to the 1970s, including the Vietnam War. The PASGT helmet was also, but less commonly, known by its wearers as the "Fritz" helmet for its resemblance to the Stahlhelm, which was the standard helmet used by the German military forces in the First and Second World Wars. On the other hand, the PASGT vest was colloquially known as the "flak jacket" or "flak vest" by its wearers in the U.S. military, a continuation of the nickname from earlier nylon and fiberglass-based protective vests. Helmet The PASGT helmet is a combat helmet first employed by the U.S. military in 1983 and eventually adopted by many other military and law enforcement agencies internationally. The shell is made from 19 layers of Kevlar, a ballistic aramid fabric treated with a phenolic resin system, and is rated at Threat Level IIIA. The helmet and offers