The sole-source, follow-on contract to Missouri's Eagle Industries, a business unit of ATK of Minnesota, is worth $18.5 million.
The SPC system works in conjunction with BAE System's soft armor ballistic package and provides the Marines with a lightweight, yet effective body armor solution that supports an overall effort to lighten the load of Marines.
The company said production is under way and deliveries are expected to be completed early next year.
"The SPC system provides troops with protection they need while lightening the load they carry into the field," said Ron Johnson, president of ATK's Security and Sporting group. "We remain flexible in order to deliver affordable innovation to support U.S. Marines and the mission at hand."
ATK said in a news release that Eagle has produced 65,000 systems to date.