"Huey", a Bell UH-1H helicopter, was donated by the Maryland Air National Guard in 1998 to UMD's Department of Aerospace Engineering. It is an example of a popular type of helicopter first put into service in 1959, and is also known as the "Iriquos" helicopter. You can read more about this specific helicopter from The Diamondback, the Department of Aerospace Engineering, and Terrapin Tales.
At stage two, look around for a resident groundhog, and check out the stream for turtles (terrapins?) and fish. Be stealthy, though! This is a fairly busy area during the week.
At the posted coordinates, look into the helicopter and find a "CAUTION" sign above the window. With your back to the buildings, the CAUTION sign will be on the opposite side of the helicopter - no need to climb into the helicopter! There are three words under "CAUTION": enter them without spaces into certitude. For example, if the words were "UMD Helicopter Here", enter it as "umdhelicopterhere".
You can validate your puzzle solution with certitude.