With several gunners firing at the same target A it's not easy to tell which have scored the hits, since ordinary bullets do not leave telltale marks. This has been solved at the United States Army Air Corps flexible gunnery school in Texas by dipping machine-gun bullets into colored paint just before they go into the training planes from which student gunners fire them at a towed target. The paint-coated bullets leave prints in the 14-foot sleeve of white canvas which help identify the gun from which each bullet was fired. That the students attain excellent marksmanship is indicated by one of the canvas targets which bore 287 holes from 300 shots that were fired at it.