This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
text FHB Japanese balloon FuGo. Demolition block shows tin container and twopound paper covered with Picric Acid charge. Holes on side and end are for blasting cap. Received February from HQ. Fourth Air Force San Francisco California. U.S. Army Air Corps Air Force photograph now in the collections of the National Archives.