Happy 131st Birthday United States Public Health Service Commissioned Corps (founded January 4, 1889); frequently called the Commissioned Corps of the United States Public Health Service. United States Public Health Service Commissioned Corps – https://en.wikipedia.org/wiki/United_States_Public_Health_Service_Commissioned_Corps is one of the least talked about uniformed services.
According to 5 U.S.C. § 8331, service in the PHSCC after June 30, 1960 is considered military service for retirement purposes. Under 42 U.S.C. § 213, active service in the PHSCC is considered active military service for the purposes of most veterans’ benefits and for antidiscrimination laws.
Here are the other uniformed services: https://en.wikipedia.org/wiki/Uniformed_services_of_the_United_States.
Additional information – https://www.hhs.gov/surgeongeneral/corps/index.html.
The above links are a good start for learning more about the United States Public Health Service Commissioned Corps specifically and the United States Public Health Service: https://en.wikipedia.org/wiki/United_States_Public_Health_Service in general.