Another invisible line is the Qinling-Huaihe line, which separates China into two distinct regions: the humid and subtropical south and the dry, temperate north.

WASHINGTON (AP) — The Army was one of 28 government agencies authorized to fly helicopters near Ronald Reagan National ...

Col. Tim Zerbe, the State Army Aviation Officer at Pennsylvania National Guard, describes what it's like to fly a Black Hawk ...

Describing something as a “Continuity of Government” operation is a blanket term. The helicopter unit out of Fort Belvoir ...