07dec2017 Okinawa pic: CH-53 dropped small part on roof

[Stratofreighter]

...but what is it?

The red thingy at
https://headlines.yahoo.co.jp/hl?a=2017 ... 4-mai-Soci
/
https://headlines.yahoo.co.jp/hl?a=2017 ... i.view-000

hardly made a dent on the roof of this nursery school/kinderdagverblijf...

https://aviation-safety.net/wikibase/wiki.php?id=202628
...has a description on this cylinder and the circumstances.

Date: 07-DEC-2017
Time: 10:20 LT
Type: Sikorsky CH-53E Super Stallion ?
Owner/operator: USMC ?
Location: 300 m from Marine Corps Air Station Futenma (ROTM), Okinawa - Japan