21 June 1813 Peninsular War: Wellington defeats Joseph Bonaparte at the Battle of Vitoria.

21 June 1898 Spanish-American War: The United Statesicon captured Guam from the Kingdom of Spain.

21 June 1900 Boxer Rebellion: China formally declares war on the United States, Britain, Germanyicon, Franceicon and Japan.

21 June 1916 A U.S. military expedition against Mexican revolutionary Pancho Villa brings the United States and Mexico closer to war when Mexican government troops attack U.S. Brigadier General John J. Pershing's force at Carrizal, Mexico.

21 June 1942 : General Erwin Rommel takes control of Britishicon Allied garrison at Tobruk, Libya, taking more than 30,000 prisoners.

21 June 1942 World War II: Tobruk falls to the Italians and the Germans.

21 June 1942 World War II: A Japaneseicon submarine surfaces firing 17 shells at nearby Fort Stevens near the Columbia River in Oregon in one of only a handful of attacks by Japan against the United States mainland.

NOTE DATE WWII: Guam lightly defended by the US, was captured by Japan on December 10 in 1941, three days after the attack on Pearl Harbor.
The Battle to retake Guam was tentatively set for June 18. But a large Japanese carrier attack and stubborn resistance by the unexpectedly large Japanese garrison on Saipan led to the invasion of Guam being postponed for a month. So the Battle to retake Guam wasn't fought until ground troops stepped ashore on July 21 to August 10, 1944.

Guam is situated in the Mariana Islands. It was declared secured by mid August 1944, though a Sergeant Shoichi Yokoi, held out until 1972. In the weeks after the battle, engineers transformed Guam into a major Allied base that included five airfields. These, along with other airfields in the Marianas, gave USAAF B-29 Superfortresses bases from which to commence striking targets in the Japanese home islands.

21 June 1945 WWII: Japanese troops were defeated on the Pacific island of Okinawa after one of the longest and bloodiest battles of World War II. Having seized the Ryukyu Islands from Japanese control, the United States next prepared to launch an onslaught against the Japanese mainland.

Well, we know this carbine couldn't have been on Guam in June of 1944. But very well could have been being carved on while waiting on a landing. Having the first planned landing set for June 18~21 but it was delayed.

Any Idea what unit the previous owner may have been in? 3rd Marine?

Bottom picture: from an earlier island-hopping campaign in The Battle of Eniwetok Feb of 44...

Cheers,
Charlie-Painter777