1942: The US Navy's Battle of Midway winds down as surface fleet combatants move to disengage, the Japanese lost four carriers to the American's one. Yorktown was under tow on the 6th, expected to once again be salvaged, when she was discovered and attacked by a Japanese submarine; she was lost early the 7th.
As the Navy's battle wound down the Marine's battle was just beginning; Marine air elements began to engage the remnants of the Japanese fleet on the 6th. These battles were the first large-scale Allied victories against the Japanese juggernaut and although hard fighting was yet ahead they signaled the beginning of the end of Japanese dominance in the Pacific.
1944: D Day invasion of France at Normandy; the allies landed on Utah, Omaha, Gold, Juno, and Sword Beaches beginning at 6:30 AM, establishing beach-heads for continued operations and sustaining 4,414 casualties by the days end. This is the largest amphibious operation in history to date, and if God is merciful it will be the largest one ever.
Every day we lose more and more of these men, and the world is left poorer by their passing.
And finally, I would be remiss at this time if I did not acknowledge the last of the Navajo code-talkers, Chester Nez, who passed on the 4th at the age of 93. Well done Marine, Semper Fi.