For the next year, until Jan 2013, you can see an excellent bit of the Marine Corps Combat Art Collection at the NASM, in a show entitled, "Fly Marines! The Centennial of Marine Corps Aviation 1912-2012." ( See a review of the show in the Washington Post Arts Section here).
Howard Chandler Christy, Felix W. De Weldon, Howard Terpning, Col. Avery Chenoweth, Col. Michael Gish, Col Edward Condra, and James Butcher, to name a few.
Here are some examples of the fine Marine Corps Aviation art on display there:
Two of Marine Corps Staff Sgt. Kristopher Battles sketches on display at the “Fly Marines!” exhibit in the National Air and Space Museum. SHFWire photo by Frank Bumb