We MUST preserve this environmentally fragile world of our's so that our children have something to war over!

IIRC the beginning of Interstellar featured an Indian Air Force drone that had been wandering aimlessly in the air for, presumably, years, just living on solar cells, a forgotten relic of whatever Resource War happened before the events of the movie. Always thought that was a neat concept.

@PugJesus It also looks like a Hey Shoot ME! kind of target, too.