Sam Hanna (portrayed by LL Cool J) is a fictional character in the show NCIS: Los Angeles. He is a former U.S. Navy SEAL and a Senior NCIS Special Agent. He first appeared in the NCIS season six episode "Legend (Part I)". From Wikipedia
In Season 22, Episode 18, Hanna leaves lobbying to rejoin fieldwork, delivers updates on Callen, Anna, and Tennant, and hints at Hetty Lange's location in a DMZ.