"Please pray for those who carry on without their loved ones," Chris Holm of the Superblock said during the program's introduction.
Lab employee Jennifer Nelson sang the national anthem.
The flag displayed at the northwest entrance to the Superblock was changed by firefighter Ken Rinna, who accepted a new flag from members of the Lab's Protective Force Division's honor guard.
This year the flag previously flown was presented to Holm for his efforts. Holm who will be retiring from the Lab this year, is credited with initiating the annual ceremony at the Superblock.
"Thank all of you for everything you do every day to contribute to the safety our nation," Miller said. "This flag means a lot. These gifts are very special."