Intruders beware: When this 80-pound German Shepherd isn’t patrolling Naval Air Station Patuxent River, Maryland, he’s training to take trespassers down at the drop of a command. Bleck, a 6-year-old German Shepherd, is assigned to Navy Installations Command as a member of Pax River’s force protection team along with his handler, Master-at-Arms 2nd Class Evan Desrosiers. Desrosiers knew when he joined the Navy more than a decade ago that he wanted to be a dog handler, he told Navy Times Tuesday, but he had to spend some time in the fleet as an MA before he could get orders for training at…