Editing M1 helmet (section)

===Service===
{| class="wikitable floatright" style="text-align:right; margin: 20px 20px 0px 20px;"
|+Total production per year 1941–45<ref>{{cite web|url=https://www.militaria-deal.com/militaria-blog/us-m1-helmet-guide|title=The US M1 Helmet Guide|website=Militaria-Deal}}</ref>
|-
! Year 
! Number made
|-
|1941 || 323,510
|-
| 1942 || 5,001,384
|-
| 1943 || 7,648,880
|-
| 1944 || 5,703,520
|-
| 1945 || 3,685,721
|}
[[File:"Coast Guardsman Charles Tyner, Fireman first class, examines the jagged shrapnel hole in the helmet he wore during the - NARA - 513183.jpg|left|thumb|[[U.S. Coast Guard]] Fireman First Class Charles Tyner with his M1 helmet following [[Operation Dragoon]] in August 1944. His M1 helmet blocked a piece of shrapnel that would have otherwise fatally struck his head, inflicting a "superficial scratch" instead.]]
Over 22 million U.S. M1 helmets were manufactured through September 1945.<ref name="stanton">Stanton, Shelby L., ''U.S. Army Uniforms of World War II'', Stackpole Books, 1995, {{ISBN|0-8117-2595-2}}, url:[https://books.google.com/books?id=Lita2OQpHDsC&pg=PA57], pp. 57–58</ref> Production was done by the McCord Radiator and Manufacturing Company and the Schlueter Manufacturing Company;<ref name="Maker" /> the former developed a method to create an almost eighteen-centimeter-deep bowl in a single pressing, which was considered an engineering milestone at the time.<ref>Tenner, Edward (2003), ''Our own devices: The past and future of body technology''. New York: Alfred A. Knopf. p. 252. {{ISBN|978-0375407222}}</ref>

In 1942, the helmet bails were changed from a fixed, welded version to a swivel model along with slight alterations to the shaping of the side brim, while in 1944, the stainless steel helmet rim with a seam at the front was replaced by a manganese steel rim with a rear seam. Further M1 helmets were manufactured for the [[Korean War]].<ref name="Brayley2008_p.123">Brayley 2008, p. 123</ref>

Following World War II, the M1 helmet was widely adopted or copied by numerous other countries and its distinctive shape was adopted as the [[NATO]] standard. Postwar analyses of wartime casualty figures by the U.S. Army Operations Research Office found that 54 percent of hits to the M1 helmet failed to penetrate, and estimated that 70,000 men had been saved from death or injury by wearing it.<ref>Brayley 2008, p. 11</ref>

Production continued during the [[Cold War]] era with periodic improvements; in 1955 a grommet in the front of the liner was deleted, in 1964 the liner construction was changed to laminated [[nylon]], and in 1975 a new chinstrap design was introduced. The final contract for U.S. M1 helmets was placed in 1976.<ref name="Brayley2008_p.123"/> The M1 was phased out of U.S. military service during the 1980s in favor of the [[Personnel Armor System for Ground Troops|PASGT helmet]],<ref>Hartzog, William W. (2014), ''[https://books.google.com/books?id=xUbRprRBFfkC&pg=PA224 American Military Heritage]'', Washington DC: Military History Office, US Army Training and Doctrine Command. p. 224. {{ISBN|978-1505496604}}</ref> which offered increased [[ergonomics]] and ballistic protection.