In a news release, the office said:
The inert rocket launch tube, empty of any explosive hazard and inspected by the U.S. military for safety, was brought back on a military flight by a United States Air Force Sergeant as a souvenir of their service abroad.
The rocket launcher part reportedly presented "no immediate threat to anyone on the ground," but "there is a slight chance that it could contain pressurized gas, and was therefore not allowed on the Sergeant's connecting flight."
The unnamed Air Force sergeant is expected to eventually get his rocket launch tube back.
"The Office of the State Fire Marshal's Bomb Squad took possession of the launch tube until it can be safely returned to the owner," the news release said.
The office cautioned that "[w]hile it is not uncommon for military personnel to return home with momentos [sic] from their tours of duty, it is important that they are made aware of the differing regulations for their connecting commercial flights versus their military flights."
On Monday, the TSA found another missile launcher at BWI that was also being carried back to the U.S. by someone from the military. However, in this case the fire marshal opted to dispose of the launcher.