Principal Staff Assistants 

Type - Term
Description: The Under Secretaries of Defense, the Director of Defense Research and Engineering, the Assistant Secretaries of Defense, the General Counsel of the Department of Defense, the Comptroller of the Department of Defense, the Assistants to the Secretary of Defense, and the OSD Directors or equivalents who report directly to the Secretary or Deputy Secretary of Defense. (Source: DoDD 5100.81, Department of Defense Support Activities (DSAs)) 
Acronym: PSA
 
Comments: Enterprise Transition Plan Glossary