A security checkpoint at Dallas/Fort Worth International Airport was shut down for about an hour after screeners found a live round of ammunition in a carry-on bag Monday afternoon.
Security screeners found a 40 mm round in the luggage of a military passenger at a checkpoint in Terminal D near Gate 30.
The ammunition is the kind the military uses in grenade launchers.
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Police said the incident was an accident, saying the soldier thought he had cleaned everything out of his bag.
DFW Airport spokesman David Magana said the airport set up a 300-foot perimeter around the bag. The checkpoint was down for about an hour, and no flights were affected.
Airport screeners found 1,306 guns in carry-on bags last year. Airport officials say TSA agents are spotting contraband and stopping it before it makes its way onto flights.
"[It's] very refreshing, especially when you are waiting to go home," said traveler Judy Major. "I can't say enough how that handled it -- it was perfect."
NBC 5's Ellen Goldberg contributed to this report.