2 p.m., Navy officials released another update, saying the shelter in place order had been lifted for all parts of the facility, with the exception of Building 26, and personnel were permitted to move about.

Access to NMCSD was resuming, as well as patient care, officials said. The main and emergency gates to the facility were reopened to outbound traffic.

By 3:40 p.m., the shelter in place order was lifted for Building 26 as well.

"Operations are going back to their normal cycles at the hospital as patient care and access to the NMCSD facility is resuming to business as usual," Navy officials said.

According to the NMCSD’s website, Building 26 -- the site at the center of Tuesday's incident -- houses several amenities, including a fitness center. The Liberty Center isalso located near Building 26, and offers recreational activities for all active duty service members and NMCSD ID cardholders, including a cyber café, billiards tables, a music room and a 25-seat movie theater.

The large staff at NMCSD is comprised of more than 6,500 military, civilian, contractor and volunteer personnel. The 272-bed, multispecialty hospital and ambulatory complex is located on 78.4 acres in the southeast corner of Balboa Park, about 2.5 miles from downtown San Diego.

The military hospital treats families of military members, too.

NMCSD personnel deploy to Iraq, Afghanistan, Kuwait, Djibouti and aboard the USNS Mercy. The facility is affiliated with 19 civilian nursing schools, training more than 400 students per year in clinical rotations.