Tensions — and fears — ran high in the days following the Sept. 11 terror attacks on America. Those who safeguard our country were on alert —&nbsp; on land, air and sea. When this photo was taken on Sept. 19, 2001, National Security United States Coast Guard sailors from Port Security Unit 307 passed by the USS Constitution as they patroled Boston Harbor. The unit comprised of 120 sailors, and based in St. Petersburg, Fla., began patrolling the harbor Sept. 14 in the wake of the attacks on New York and Washington. (AP Photo/Steven Senne)

National security was top of mind following the 9/11 terror attacks, as a photo of a special Coast Guard unit passing Old Ironsides as it patrolled the Harbor can attest.{ai:summary}<p>In the aftermath of the September 11, 2001 terror attacks, national security heightened, with military operations intensified across air, land, and sea. National Security United States Coast Guard sailors patrolled Boston Harbor, reflecting increased vigilance during this period.</p><p>The Coast Guard's Port Security Unit 307, stationed in St. Petersburg, Florida, began its patrol on September 14, 2001, two days after the attacks. The heightened security measures aimed to protect the nation from further threats. #military</p>

Throwback Thursday: Guarding Boston Harbor after 9/11

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