An infantryman refers to a specific role within the army, distinct from roles like pilots or tank operators. The army trained John to serve as an infantryman, specializing in ground combat.
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Combat Specific
An infantryman is primarily associated with direct combat on the battlefield, not with support or administrative duties. During the battle, each infantryman was tasked with securing a section of the territory.
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Not a Rank
'Infantryman' describes a role within the infantry; it's not a military rank like Sergeant or Lieutenant. As an infantryman, he was one of the many soldiers reporting to the platoon sergeant.