You can provide yer own humorous caption for this one

[andrewducker]

(It's a silencer for a tank. So they can practice firing it without annoying everyone in a five mile radius.)

Comments

[cartesiandaemon.livejournal.com]

"In 2011, Hollywood discovered their 'realistic inconvenience of using a silencer on a gun' index had fallen woefully below par and formed a fiendish plan to bring it back up to scratch in just one scene..."