The following is the Sept. 15, 2021, Government Accountability Office report Coast Guard: Information on Defense Readiness Mission Deployments, Expenses, and Funding.
From the report
One of the six armed forces, the U.S. Coast Guard is a multimission maritime military service within the Department of Homeland Security (DHS). It is responsible for implementing 11 statutory missions. One mission—Defense Readiness—requires the Coast Guard to maintain the training and capability needed to integrate...
https://news.usni.org/2021/09/22/gao-report-on-coast-guard-defense-missions