The squad automatic weapon: how infantry units balance mobility with high-volume suppressive fire

Wars & Conflicts · Published 15 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: A squad automatic weapon provides infantry units with rapid, portable firepower. By using the same ammunition as standard rifles, these weapons streamline logistics while offering the sustained fire necessary for modern combat. From the early Madsen to the modern FN Minimi, these tools define how fireteams maneuver and suppress.

A squad automatic weapon (SAW), also known as a light support weapon, is a man-portable firearm designed to deliver rapid, direct firepower to infantry squads. Unlike heavy machine guns that require crews and mounting platforms, a SAW is light enough for a single soldier to operate. These weapons are typically modified assault rifles or purpose-built light machine guns, often featuring heavier barrels to withstand the heat of sustained fire and bipods for stability. By sharing the same service ammunition as the unit's standard rifles, SAWs simplify the logistical burden of supplying multiple types of cartridges in the field.

The evolution of the SAW reflects changing tactical needs. Early designs like the Madsen machine gun introduced portable automatic fire to an era dominated by bolt-action rifles, though they were limited by magazine capacity. During World War I, the Browning Automatic Rifle (BAR) emerged, eventually becoming a cornerstone of U.S. fireteam doctrine. As warfare shifted, so did the technology; the U.S. military’s SAW program in the 1970s sought a weapon lighter and more reliable than the M60 machine gun, eventually leading to the adoption of the belt-fed FN Minimi, known in U.S. service as the M249.

Modern militaries continue to refine this role. The U.S. Marine Corps, for instance, launched an Infantry Automatic Rifle program in 2005 to find a more mobile alternative to the M249, resulting in the adoption of the M27 IAR. Meanwhile, the U.S. Army’s 2019 Next Generation Squad Weapon Program sought to replace both the M249 and the standard 5.56mm NATO round, ultimately selecting the SIG Sauer XM250 chambered in 6.8mm. These transitions highlight a constant tension: balancing the need for high-volume, sustained suppressive fire with the requirement for infantry to remain agile and effective on the move.

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