The 5"/38 caliber gun is the largest weapon tn the Ingham. The term 5"/38 caliber, indicates a bore diameter of 5 inches , and a barrel length 38 times greater than the bore (190"). the 5"/38 was introduced into the Navy in 1934 as a dual purpose gun, capable of firing at both surface targets and aircraft. It saw extensive service by the Navy and Coast Guard during WWII and remained in use well into the 1980's.
The Maximum effective range for this weapon was 18,200 yard and it had an average rate of fire of 15 rounds per minute.