The department has a number of specialized units, including the Gun Recovery Unit (GRU) and District Crime Suppression Teams (CSTs). Other specialized units in the MPD are under the Special Liaison Branch works with various parts of Washington's population. Within the branch are four units: the Asian Liaison Unit (ALU), the Deaf and Hard of Hearing Liaison Unit (DHHU), the Gay and Lesbian Liaison Unit (GLLU), and the Latino Liaison Unit (LLU), which collectively have 196 members. Within MPD's Homeland Security Bureau is the Special Operations Division and the Joint Strategic & Tactical Analysis Command Center. Within the Special Operations Division is the Training Unit, Special Tactics Branch, and the Special Events Branch; the latter two units coordinate with the U.S. Secret Service.