A Marine squad leader assigned to Company C, 1st Battalion, 1st Marine Regiment, 1st Marine Division, provides security during a company-level assault, as part of combined arms live-fire, Marine Rotational Force – Darwin exercise, aboard Marine Corps Air Ground Combat Training Center Twentynine Palms, California, Jan. 18, 2016. Infantry squad leaders holding the rank of corporal or sergeant can apply now for the recently updated Squad Leader Development Program, and earn the new military occupational specialty of 0365 - Infantry Squad Leader if selected from the pool of applicants. - A Marine squad leader assigned to Company C, 1st Battalion, 1st Marine Regiment, 1st Marine Division, provides security during a company-level assault, as part of combined arms live-fire, Marine Rotational Force – Darwin exercise, aboard Marine Corps Air Ground Combat Training Center Twentynine Palms, California, Jan. 18, 2016. Infantry squad leaders holding the rank of corporal or sergeant can apply now for the recently updated Squad Leader Development Program, and earn the new military occupational specialty of 0365 - Infantry Squad Leader if selected from the pool of applicants.