<p>WASHINGTON — As Navy Petty Officer 2nd Class Randall Smith fights for his life after being shot at a military support center in Tennessee, his grandmother wonders why troops at recruiting and reserve offices aren't allowed to have guns.</p>
<p>It's a question many were asking Friday, a day after the deadly shooting that killed four Marines and injured three others in Chattanooga. Military officials say the Pentagon shouldn't rush to change the ban, which is governed in part by century-old law, because arming troops in those facilities could cause more problems than it might solve.</p>