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**FILE **  Dr. Deborah Persaud, a pediatric HIV expert at Johns Hopkins' Children's Center in Baltimore, holds a vial while at Johns Hopkins Medicine in 2005. (AP Photo/Johns Hopkins Medicine, File)
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**FILE ** Dr. Deborah Persaud, a pediatric HIV expert at Johns Hopkins' Children's Center in Baltimore, holds a vial while at Johns Hopkins Medicine in 2005. (AP Photo/Johns Hopkins Medicine, File)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.