Based on the Coast Guard Historian’s timeline, https://www.history.uscg.mil/research/chronology/
With inspiration from Mike Kelso

March 31

1932  The United States signed a Whaling Convention at Geneva with 21 other countries.

USCGC Tuscarora

1934  At high noon on March 15, 1934, CGC Tuscarora fired a shot from one of its batteries, a shot that started the fifth international St. Petersburg to Havana racing classic.  Tuscarora served as the official Coast Guard escort for the race.

World War II US Naval Districts from which the USCG Districts were derived.

1948  The Tenth District, with headquarters at San Juan, Puerto Rico and comprising of the Panama Canal Zone, all of the island possessions of the United States pertaining to Puerto Rico and the Virgin Islands, and all United States reservations in the islands of the West Indies and on the north coast of South America, was abolished, and its functions, responsibilities, and facilities were transferred to and combined with the Seventh District, with headquarters at Miami, Florida.

1995  Coast Guard Communication Area Master Station Atlantic sent a final message by Morse Code and then signed off, officially ending more than 100 years of telegraph communication.

Response Boat, Medium (RB-M). Photo from Vigor

2008  The U.S. Coast Guard took delivery of its first Response Boat–Medium (RB-M) from Marinette Marine Corporation.  Following completion of underway trials on March 17, 2008 near Tacoma, Washington, RB-M 45601 was trailered cross-country for delivery in Portsmouth, Virginia.  After one week of familiarization for the Coast Guard Transition Team (responsible for facilitating the introduction of the planned 180 boats to the fleet) Station Little Creek, Virginia took delivery of RB-M 45601 on April 7, 2008. The RB-M acquisition was initiated to replace the aging 41’ Utility Boats and other Non-Standard Boats.  The RB-M is a self-righting, 45-foot all-aluminum boat with twin diesel engines and water jet propulsion.