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Senior Airman Jeremy Nunez from Selfridge Air National Guard Base, 107 Weather Flight, fires an M-4 rifle loaded with a 5.56 millimeter round during the annual Gray Wolverine training exercise held at Combat Readiness Training Center Alpena Michigan on July 20, 2011. SrA Nunez said “the 5.56 round contains more fire power than a standard round traveling out of the 11-inch barrel of the M-4, which causes the fire blast.” (U.S. Air Force photo by TSgt David Kujawa))
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