2.36" bazooka round.

More than 900 pieces of unexploded ordinance were found in Okinawa this week buried underneath a restaurant.

Construction workers on a road expansion project detected the explosives with a metal detector and notified police Wednesday morning, Kiyotaka Maedomari, a senior police official in Itoman city, told AFP.

An army bomb disposal squad discovered the total of 902 unexploded munitions — including rocket bombs, grenades and motor projectiles — believed to have been made in the United States, he said. (Link)

“Rocket bombs” sounds like bazooka rounds. “Motor projectiles” may be a mistranslation of “mortar projectiles”. Here’s a page on U.S. 60mm and 81mm mortar rounds of the Second World War. I would guess they ran into a U.S. Army or Marine Corps battalion ammunition dump.

An estimated 10,000 tonnes of unexploded munitions were left in Okinawa after the war. About 4,500 tonnes remained by the time the United States returned Okinawa to Japan in 1972.

Since then, Japan’s armed forces have disposed of another 1,500 tonnes, but it is expected to take 80 years or more to remove the rest.

Okinawa will have to live with the legacy of World War II until the year 2090. By that time World War II will be as distant in Okinawa’s past as the American Civil War is today. A heavy price to pay indeed.

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A contributor and editor at the blog War Is Boring, Kyle Mizokami started Japan Security Watch in 2010 to further understand Japan's defenses and security policy.
Kyle Mizokami has 596 post(s) on Japan Security Watch