Helo Circling Mission San Jose

A helicopter made at least six large loops around the Mission San Jose area around 11:30 this morning.  The copter, N911JM, is a Vietnam era UH-1H Huey and is associated with a military preservation group.  The copter is based at Hayward Executive Airport, which it returned to at about noon.  Why it was circling is unknown. 

From the internet:

N911JM is a 1965 Bell UH-1H based at Hayward Airport in Hayward, CA., and operated by EMU Inc. This helicopter is a recreation of “EMU 309” (#68-16309), which served in Vietnam from 1969-1972. EMU Inc., is a non-profit corporation whose purpose is to preserve the history of the Huey
helicopter, the memory of the men who served in the 135th Assault Helicopter Company, and all assault helicopter companies that served in Vietnam.

The Experimental Military Unit was a joint Australian-American company-sized helicopter assault force during the Vietnam War. The unit was created in 1967 following a request from the United States military for Australia to send more helicopter pilots to the conflict. Because the only available
personnel were from the Royal Australian Navy (RAN) Fleet Air Arm (with Australian Army and RAAF pilots already heavily committed), the RAN Helicopter Flight Vietnam (RANHFV) was formed and integrated into the 135th Assault Helicopter Company of the United States Army.