Americans believe the Air Force is third-most important branch of the military, trailing the Army and Marine Corps, according to a recent national poll. Seventeen percent of respondents listed the Air Force as “most important to our national defense,” Gallup announced June 21. The Army was seen as the most important (25 percent), followed by the Marines (24 percent), the Navy (11 percent) and the Coast Guard (3 percent). Sixteen percent believed the branches were the same. Gallup interviewed 1,020 adults representing all 50 states and the District of Columbia. The margin of error was 5 percent. The findings represent…