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:
blackandwhite monochrome indoor black and white TR Colors in cartridges Air Intelligence Officer Lieutenant Junior Grade Samuel D. Trusty prepares recognition flares which are fired from very pistols flare guns in various color combinations according to code. Photograph released February . TR Colors in cartridges Air Intelligence