https://www.google.co.uk/search?q=dirty+tanks&source=lnms&tbm=isch&sa=X&ei=bmcwUs7tOIjY0QXj1IDoDw&ved=0CAcQ_AUoAQ&biw=1536&bih=745#facrc=_&imgdii=_&imgrc=zm06acvPXJ9iVM%3A%3B2Y1YUDe9YDjXWM%3Bhttp%253A%252F%252Fsoldiersystems.net%252Fblog1%252Fwp-content%252Fuploads%252F2011%252F03%252Fdirty_tank.jpg%3Bhttp%253A%252F%252Fsoldiersystems.net%252F2011%252F03%252F29%252Fspray-on-dirt-sure-why-not%252F%3B430%3B322
https://www.google.co.uk/search?q=dirty+tanks&source=lnms&tbm=isch&sa=X&ei=bmcwUs7tOIjY0QXj1IDoDw&ved=0CAcQ_AUoAQ&biw=1536&bih=745#q=tanks&tbm=isch&facrc=_&imgdii=_&imgrc=FFSG9DTi8whUSM%3A%3Bv-PyY_sfod4WQM%3Bhttp%253A%252F%252Fonlyhdwallpapers.com%252Fwallpaper%252Fmilitary_tanks_anti-aircraft_desktop_1600x1064_hd-wallpaper-1081034.jpg%3Bhttp%253A%252F%252Fonlyhdwallpapers.com%252Fmilitary%252Fmilitary-tanks-anti-aircraft-desktop-hd-wallpaper-1081034%252F%3B1600%3B1064