July 15th, 1937
15 of the new Benham-class destroyers are laid down. These ships could displace 1,620 tons standard and 2,474 tons fully loaded and came armed with 5 5in dual-purpose guns, 6 .50 caliber machine guns, 10 21inch torpedo tubes and 2 depth charge launchers*.
August 13th, 1937
The Battle of Shanghai begins.
September 3rd, 1937
Grumman engineers put the finishing touches on their new F4F-2 monoplane prototype. Originally having been a biplane, the Navy rejected sich a plane and a complete redesign was down to modernize it. Pretty soon, they'd be ready to present it to the Navy.
December 12th, 1937. USS Panay, Yangtze River, off Nanking
The Nebraskan Marine cleaned his machine gun. After completing basic training, he had been sent to the garrison in Shanghai just in time for the Chinese and Japanese to start killing each other in droves. Well, the killing was mostly one-sided since the Japanese seemed to advance over mountains of Chinese corpses every battle. And should luck have it, here he was crewing a gunboat on a river whose name he couldn't pronounce. He'd volunteered for the position after one of the sailors had managed to get himself killed while coming back from a brothel in Shanghai. Yesterday, they'd all been busy evacuating the last Americans out of Nanking since the city had fallen to the Japanese and now here they were anchored just outside that same city.
He heard a buzzing in the air and saw Japanese planes flying towards them. At first, he thought that they would simply fly over the gunboat, but then the planes broke formation into a dive. That didn't make any sense. There were American flags draped over the ship, in clear view of the swooping planes. It still didn't add up until he saw muzzle flashes. Men screamed as bullets slammed into them and the ship. The fighters rose back up, but a bomber kept coming. The bombs dropped and the plane pulled up. Blast rocketed him off the ship and into the river. He spurted out water as he surfaced, bobbing in the flow of the river. The Panay was sinking, two bombs had been all it took. The survivors began swimming for shore or for cover as the Japanese fighters dove again. The Marine saw the machine guns twinkle and then felt two thuds. He looked down at himself in shock. Blood was leaking from two bullet wounds. He tried to keep swimming but his legs didn't seem to want to move. His head slid under the water as darkness covered him.
*=These stats are from OTL Benson-class since as far as I can tell, they were the first US destroyers that weren't under London Naval Treaty obligations when built.