 In 1942 the reservation had an unnamed battery of two 155 mm towed guns on "Panama mounts", circular concrete platforms for this type of gun.This battery was withdrawn in 1943 when an Anti-Motor Torpedo Boat (AMTB) battery of four 90 mm guns called AMTB 934 was built.This battery had an authorized strength of four 90 mm guns, two on fixed mounts and two on towed mounts, plus two towed 37 mm M1 guns or 40 mm Bofors M1 guns.