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Actually, the "fleet of destroyers" was, like many of the newer cruisers (both heavy and light), battleships and carriers, were designed pre-war and were being laid down before the first bomb was dropped. FDR knew that war was coming and got the navy in on it earlier. Building ships took a long time and it required not only design, but dedicating shipyards, material, construction crews, manning and training the crews. Tanks and airplanes have a shorter time from board to field (except today).
The Fletcher class DDs were actually conceived in 1939 and the first ones coming out in 1942.
BTW, I dropped a lot of ducats on the Naval Institute Press for books. Hanging around you guys is getting expensive.
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True the designs were in, but the Escort Carriers & Destroyer Escorts were convoy escorts only until the Pacific Theater got hot.
800 Destroyer Escorts were commissioned in WW2 but were originally designed for convoy assistance under Lend Lease.
115 Escort Carriers commissioned in WW2, although prototype hulls were laid down in 1939.
One of the oddities of the war was the "light cruiser" designed as an antiaircraft cruiser. Instead of main batteries they went with multiple 5" guns. Those light cruisers were heavier in tonnage than our heavy cruiser, but when firing at night produced quite a light show.
Post treaty production gave us a head start in producing & launching heavier gun ships, although the Axis powers seem to have jumped out in front, Germany with the
Bismark, wasn't a match for an Iowa class battleship, Japan with
Yamato &
Musashi both of which were much heavier than the Iowa class.
Honestly though, I believe Japan displayed a fatal flaw from war's outset in not going all in to win, trying to conserve their fleet.
Contrast that against the U.S. Navy at the Battle of the Philippine Sea with 15 aircraft carriers (not including escort carriers) ranging on the offensive searching for the Japanese Navy to take the fight to them.
Back to OP, do you know what destroyer picked your grandfather up?
Aside from searching DANFS, the are websites for the Destroyer Escort Assn. (desausa.org), Escort Carriers Seamen Assn. (escaa.org) & Destroyers - Tin Can Sailors Assn. (destroyers.org). Task group assignments are sometimes sketchy, but major task force compositions are listed.