1955:	Effective this date, all foreign and domestic ships are required to give 24-hour advance notice to the local US Coast Guard Captain of the Port before entering US ports.  This order was designed to improve the US Coast Guard Port Security program without material inconvenience to shipping.
1965:	The beginning of the US Navy’s Operation Market Time to interdict resupply of Communist forces in South Vietnam by river and coastal routes.  The initiation of this campaign led to the Navy’s request for USCG vessels and crews to participate in riverine and coastal patrols during the Vietnam War.