Called "TSA PreCheck," the screening allows travelers to pass through security without taking off shoes, jackets or belts, and without taking out items approved for carry-on luggage.

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Active-duty members of the U.S. Armed Forces are eligible for expedited security screening at Seattle-Tacoma International Airport.

On Tuesday, Sea-Tac became the second airport in the nation to offer this option to service members, according to Lorie Dankers, a spokeswoman in Seattle for the Transportation Security Administration.

The screening is called “TSA PreCheck,” and enables travelers to pass through security without taking off their shoes, jackets or belt. PreCheck also allows travelers to pass through screening without taking computers out of their cases, and without removing small amounts of aerosols, liquids and gels approved for carry-on luggage.

Though most active-duty service members who show up for PreCheck can receive the service, it is not guaranteed. Some PreCheck travelers still are sent through the regular screening as part of TSA’s effort to preserve a “random unpredictability,” Dankers said.

Service members who qualify for PreCheck include National Guard and Reservists involved in active drilling, according to Lt. Col. Robert Ditchey, a Department of Defense spokesman.

They don’t have to be in uniform or flying as part of their work to use the service, Ditchey said.

To participate, service personnel must bring a form of identification, the Common Access Card, to the airport. and present it to a TSA officer at the PreCheck lane. This will allow verification of the service member’s status.

The designated checkpoint at Sea-Tac is No. 5 in the north end of the terminal, where a special screening lane is located.

The system currently can be used on domestic flights as well as Air Mobility Command flights to Japan and Korea, according to Dankers.

Information compiled by Hal Bernton: 206-464-2581 or hbernton@seattletimes.com