ASQ/DON Lean Six Sigma Black Belts 这句话中DON是什么意思?

Department of Navy
DoN and ASQ Team Up On Lean Six Sigma Project
The Department of the Navy (DoN) will jointly conduct a Lean Six Sigma Black Belt certification process along with the American Society for Quality (ASQ).An agreement has been reached through which a testing standards program that will meet the needs of the Navy and the Marine Corps team will be developed by both DoN and ASQ,and administered by ASQ.