According to the Museum’s website (which also provides technical specifications):

Courtesy of the United States Coast Guard

The HH-52/S-62 was the forerunner of a new generation of turbocopters and was the world’s first true amphibious helicopter. It was designed to operate from land, water, snow, ice, mud, swamp and tundra. This helicopter was one of 99 similar craft built for the U.S. Coast Guard with its role as a search and rescue and general utility craft. The “Seaguard” was a workhorse for the Coast Guard and they were based on Coast Guard cutters, icebreakers and air stations until they were retired in 1989. HH-52’s were credited with saving over 15,000 souls on their 25 years of service. This aircraft was stationed at the Detroit Coast Guard Air Station.

As the S-62A, it was the first turbine rotorcraft to be granted FAA approval for commercial use.

Taken with a Sony RX-100 M3.