From UFStarfleet Wiki
The Light Infantryman is the basic Military Occupation Specialty (MOS) and arguably the most important within the United Federation Starfleet. Although the traditional name of Infantryman is used, assignments to this MOS are not limited by sex. Light Infantrymen receive extensive training in basic infantry tactics and skills including marksmanship, orienteering, light infantry weapons operation/maintenance, basic reconnoitering, etc.
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