SAN DIEGO (March 22, 2021) Border Patrol K-9 Agent Sergio Santana conducts narcotics detection training with K-9 Lucky hosted by Maritime Expeditionary Security Group (MESG) 1 Training Evaluation Unit. The Maritime Expeditionary Security Force is a core Navy capability that provides port and harbor security, high value asset security, and maritime security in the coastal and inland waterways. (U. S. Navy photo by Gunner's Mate 1st Class Christopher Olson)