Chief Petty Officer Hermsen is the senior enlisted leader of the U.S. Naval War College and serves as the command career counselor. He enlisted under the seaman apprentice program in 1996. His sea duty assignments include USS Ford (FFG 54), USS Lake Champlain (CG 57) and Coastal Riverine Squadron Four (CRS 4). His shore assignments include Naval Air Station Whidbey Island, Fleet Activities Sasebo in Japan, and Navy Expeditionary Combat Command headquarters.