Keywords: USS Impervious (MSO-449).jpg A port bow view of the ocean minesweeper USS IMPERVIOUS MSO 449 following the vessel's departure from the Washington Navy Yard Location WASHINGTON DISTRICT OF COLUMBIA DC UNITED STATES OF AMERICA USA Camera Operator DON S MONTGOMERY USN RET Shot 7 Jul 1990 PD-USGov-Military-Navy USS Impervious MSO-449 |