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During World War I, they were called doughboysbecause crawling through the European mud gave their uniforms adough-like color. For the soldiers who served in the Vietnam War,the word grunt was not just a nickname but also a commentaryon their status in the hierarchy of war. To be a grunt wasto be in the infantry.
Just so, why are infantrymen called grunts?
In the U.S. military, the slang term among both Marineand Army infantrymen for themselves is "grunt." Inthe British Army, they are the "squaddies." The infantry isa small close-knit community, and the slang names are terms ofendearment that convey mutual respect and sharedexperiences.
In this regard, why do we grunt?
When we forcefully push air out, the brain sendsinformation down to the muscles, which either excites muscle groupsor decreases inhibition — or both. The result is enhancedperformance. This beneficial effect of grunting wasdemonstrated in a study of college tennis players.
POGs and Grunts – Though every Marine is atrained rifleman, infantry Marines (03XX MOS) lovingly calltheir non-infantry brothers and sisters POGs (pronounced“pogue,”) which is an acronym that stands for PersonnelOther than Grunts. POGs call infantrymen Grunts, ofcourse. 16.