Editing Tennessee-class battleship (section)

===Modifications===
[[File:Vought UO-1 on float NAN3-60.jpg|thumb|left|One of ''Tennessee''{{'}}s [[Vought UO-1]]s]]
The ''Tennessee''s underwent a series of minor modifications to their secondary and anti-aircraft armament through the 1920s and 1930s. In 1922, ''Tennessee'' had the two 5-inch guns abreast the mainmast removed and four more 3-inch guns installed, two of which were placed where the 5-inch guns had been. The other two were placed behind the forward 5-inch mounts. All eight guns were removed in 1928 and replaced with eight [[5"/25 caliber gun|5-inch /25 caliber anti-aircraft guns]].{{sfn|Cracknell|pp=205–206}} ''California'' was similarly rearmed during a refit in 1929–1930.{{sfn|Breyer|p=226}} Eight [[M2 Browning|.50 caliber machine guns]] were added, six to the roofs of the spotting tops, two on the foremast and four on the mainmast. The other two guns were placed on pedestals on either side of the foremast. ''Tennessee'' had two of the 3-inch guns returned in 1940, placed on either side of the [[bridge wing]]s.{{sfn|Cracknell|p=206}}

Other changes included the installation of aircraft-handling equipment. ''California'' had an [[aircraft catapult]] installed on her aft superfiring turret and she received three [[Vought UO-1]] [[seaplane]]s for reconnaissance and fire direction. Two years later, ''Tennessee'' was similarly modified, though her catapult was located on the [[fantail (ship)|fantail]]. In the early 1930s, she received a second catapult on her aft turret, and at some point ''California'' also had a catapult fitted to her fantail. During their 1943 reconstruction, the turret-mounted catapults were removed and both ships were fitted with just a catapult on the fantail.{{sfn|Cracknell|p=201}}{{sfn|Evans}}

[[File:USS Tennessee (BB43) 1943.jpg|thumb|''Tennessee'' after 1943 modernization]]

Both ships were extensively reconstructed and modernized after being damaged during the [[attack on Pearl Harbor]] in December 1941. New [[anti-torpedo bulge]]s were installed and their internal compartmentalization was improved to strengthen their resistance to underwater damage. The ships' superstructures were completely revised, with the old heavily armored conning tower being removed and a smaller tower was erected in its place to reduce interference with the anti-aircraft guns' fields of fire. The new towers had been removed from one of the {{sclass|Brooklyn|cruiser|1}}s that had recently been rebuilt. The foremast was replaced with a tower mast that housed the bridge and the main battery director, and their second funnels were removed, with those boilers being trunked into an enlarged forward funnel.{{sfn|DANFS ''Tennessee''}}{{sfn|Friedman|1980|p=92}} Horizontal protection was considerably strengthened to improve their resistance to air attack; 3 inches of [[special treatment steel]] (STS) was added to the deck over the magazines and {{convert|2|in}} of STS was added elsewhere.{{sfn|Friedman|1985|p=444}}

Their weapons suite was also overhauled. Both ships received air-search [[radar]] and fire-control radars for their main and secondary batteries, the latter seeing the mixed battery of 51-caliber and 25-caliber 5-inch guns replaced by a uniform battery of sixteen [[5"/38 caliber gun|5-inch/38 caliber guns]] in eight twin mounts. These were controlled by four [[Mark 37 Gun Fire Control System|Mk 37 directors]]. The light anti-aircraft battery was again revised, now consisting of ten quadruple [[Bofors 40 mm Automatic Gun L/60|{{cvt|40|mm}} Bofors guns]] and forty-three 20&nbsp;mm Oerlikons, all in single mounts.{{sfn|Breyer|p=226}}{{sfn|DANFS ''Tennessee''}} The changes doubled the ships' crew, to a total of 114&nbsp;officers and 2,129&nbsp;enlisted men. During her final refit in January 1945, ''Tennessee'' received an SP air search radar and a Mark&nbsp;27 [[fire control radar]].{{sfn|Friedman|1985|pp=358, 444}}