NMMC to Be Closed through March 2016 Construction has begun on the Final Phase of the National Museum of the Marine Corps. This section will open in phases over a 4-year period with the first part opening in 2017. As a part of the overall construction, the Museum is closed through March 2016 to hang an SBD Dauntless aircraft in Leatherneck Gallery and install a new tableau depicting a UH-34D helicopter during a Vietnam War operation in 1965...To learn more about the Final Phase please visit http://www.usmcmuseum.com/Museum_Expansion.asp