1st » World War II: Bulgaria signs the Tripartite Pact, allying itself with the Axis powers.
1st » W47NV (now known as WSM-FM) begins operations in Nashville, Tennessee becoming the first FM radio station in the United States called U.S..
2nd » World War II: First German military units enter Bulgaria Military history of Bulgaria during World War II known as after it joins the Axis Pact.
4th » World War II: The United Kingdom launches Operation Claymore on the Lofoten Islands; the first large scale British Commandos or British Commando raid.
11th » World War II: President of the United States known as President Franklin D. Roosevelt signs the Lend-Lease Act into law, allowing American-built war supplies to be shipped to the Allies of World War II called Allies on loan.
15th » Philippine Airlines, the flag carrier of the Philippines takes its first flight between Manila (from Nielson Field) to Baguio or Baguio City with a Beechcraft Model 18 making the airline the first and oldest commercial airline in Asia operating under its
17th » In Washington, D.C., the National Gallery of Art is officially opened by President Franklin D. Roosevelt.
19th » World War II: The 99th Pursuit Squadron also known as the Tuskegee Airmen, the first all-black unit of the United States Army Air Corps called US Army Air Corps, is activated.
25th » The Kingdom of Yugoslavia joins the Axis powers with the signing of the Tripartite Pact.
27th » World War II: Yugoslavian Air Force officers topple the Axis powers or pro-Axis government in a Yugoslavian military coup of March 27, 1941 e.g bloodless coup.
28th » World War II: Battle of Cape Matapan in the Mediterranean Sea, United Kingdom named British Admiral Andrew Browne Cunningham leads the Royal Navy in the destruction of three major Italy named Italian heavy cruisers and two destroyers.
29th » The North American Radio Broadcasting Agreement goes into effect at 03:00 local time.
29th » World War II: Armed Forces of the United Kingdom e.g British Royal Navy and Royal Australian Navy forces defeat those of the Italian 'Regia Marina' off the Peloponnesus e.g Peloponnesian coast of Greece in the Battle of Cape Matapan.