At the Defense Logistics Agency Troop Support, a unique Philadelphia tradition lives on. Before the city celebrates the U.S. Navy's 250th birthday on Monday, we went behind the scenes to see how hundreds of flags are made each year.

The piercing sound of stitches through fabric breaks through the silence.

"This must be one of our best-kept secrets tucked away in Northeast Philadelphia," Adam Walstrum, supervisor for the Defense Logistics Agency Troop Support, said.

Concentration is on full display inside the DLA Troop Support flag room .

"We realize that we're part of the national story," Walstrum said, "and we get to leave our mark on that every day working here."

You're looking at the Betsy Rosses of the 21st century.

"We do a sew-through method," Samanta Soifer said, "so

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