The 450,000-square-foot plant in Independence, Missouri, is expected to be fully operational by 2028.
Guard, Reserve and active-duty units with a Pacific focus are taking priority, officials said.
The SiAW would strike enemy air defense targets on the ground, and the Air Force wants it to reach initial operational capability by 2026.
The service's acquisition chief made the comments a day after Secretary Frank Kendall told lawmakers the latest ARRW test failed.
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