Happy Birthday to the Marine Corps of the United States of America! The oil painting pictured above is described on Wikipedia as:
New Providence Raid, March 1776 Oil painting on canvas by V. Zveg, 1973, depicting Continental Sailors and Marines landing on New Providence Island, Bahamas, on 3 March 1776. Their initial objective, Fort Montagu, is in the left distance. Close off shore are the small vessels used to transport the landing force to the vicinity of the beach.This was the first battle in which the Continental Marines, later to become the U.S. Marine Corps, took part and set the precedent for daring amphibious assault that became one of the hallmarks of the Corps. A good retelling is located on Military History Now.