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http://www.bbc.com/news/world-asia-42335091
It is a windowframe this time.
Part of a US helicopter has crashed on a school in Okinawa, Japan, renewing tensions with the local population.
The window dropped on the school grounds, slightly injuring one boy, news agency Kyodo said.
The US military confirmed in a statement that the window of one of its helicopters fell onto the sports ground of an elementary school outside the US Marine Corps Air Station Futenma.
CH-53E Window Falls Off During Flight
17-032 | Dec. 12, 2017
MARINE CORPS BASE CAMP BUTLER, Okinawa, Japan —
At 10:09 am today, a CH-53E window fell onto the sports field of Daini Futenma Elementary School outside of Marine Corps Air Station Futenma. The aircraft immediately returned to MCAS Futenma and reported the incident.