Senior Airman Michael Pastrone from Selfridge Air National Guard Base, 107th Weather Flight, adjusts the sights of his M-4 rifle during the annual Gray Wolverine training exercise held at Combat Readiness Training Center Alpena Michigan on July 19, 2011. By making the adjustments after shooting several rounds, Pastrone is able to consistently zero in on the center of his target, which is what he needs to achieve his annual M-4 qualification. (U.S. Air Force photo by TSgt David Kujawa)