The caption to a series of photos taken from a Facebook account says "hubbie in afghanistan raising a gay pride flag."
The pictures show a servicemember hoisting the flag up a pole next to a military tent.
According to a report in the Daily Caller, the U.S. military is looking into reports that the flag was flown in Afghanistan.
Navy Cmdr. Bill Speaks, a Defense Department spokesman, was quoted in the Daily Caller report as saying the U.S. military has no rules "that would prohibit an individual servicemember from doing this." But he noted that the International Security Assistance Force, which U.S. troops in Afghanistan fall under, may have different policies specifically for the Afghan theater.
Military officials said in the article that they still haven't determined where the flag was flown.
According to the Daily Mail, there is concern that the flying of the flag might provoke strong reactions in Afghanistan, where American lives were lost after a February incident involving the burning of Qurans.