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

April 3

1882  The schooner Morris was unable to enter Muskegon, Michigan, between the piers and was aided by the lookout of Station No. 8, Eleventh District.  He used a heaving-stick and throwing a line to get a hawser to the vessel.  The same service was rendered later in the day by two of the station men to the schooner Willis Smith of South Haven.

Lt. Jack C. Rittichier, HONORED ON PANEL 58W, LINE 14 OF THE WALL, born 08/17/1933, killed in action 06/09/1968, QUANG TRI Province, Vietnam. Awarded the Silver Star, three Distinguished Flying Crosses and three Air Medals. 

1968  Coast Guard exchange pilots arrive in South Vietnam to fly combat SAR missions with the Air Force.

Launch of USCGC Mackinaw (WLBB-30) on April 2, 2005. Photo by Peter J. Markham.

2014  CGC Mackinaw, home-ported in Cheboygan, Michigan, conducted an escort on Lake Superior near Whitefish Point.  Mackinaw’s crew worked together with the crew of Canadian Coast Guard Ship Pierre Radisson, home-ported in Quebec City, as part of an ongoing bi-national agreement between the U.S. and Canada, to break sheet ice that was nearly 40 inches thick.

Canadian Coast Guard Ship Pierre Radisson, Quebec City, Canada, 9 June 2009, Photo credit: Cephas via Wikipedia.