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The US Air Force was a thing long before we knew it by that name.
For 40 years, from the do-it-yourself days of the Wright brothers through the hellish aerial combat of World War II, the American military flew scores of different aircraft and thousands upon thousands of missions. But in large part those flyers served as members of the US Army.
Then, two years after the end of World War II, came the National Security Act of 1947. The act, which President Harry Truman signed on July 25 of that year, decreed that the Air Force should be its own separate branch of the US military, effective two months later, on Sept. 18.
Thus the US Air Force was born at the dawn of the era of jet planes, nuclear weapons and supersonic flight. This year marks the 75th anniversary.
It had barely begun its new bureaucratic existence when it recorded a remarkable aerial achievement: Capt. Chuck Yeager breaking the sound barrier in the X-1 aircraft, in October 1947. But more workaday designs were the norm, like the older C-47 Skytrain, an emissary of hope and rations for those bottled up in a divided city during the Berlin Airlift, and soon the B-36 and B-52 bombers, avatars of the Cold War doctrines of massive retaliation and mutually assured destruction.
In more recent decades, the Air Force has been at the cutting edge of aviation with stealth aircraft including the F-117 Nighthawk and B-2 Spirit, with the Predator and Reaper drones, and with the secretive X-37B space plane.
The first slideshow, above, takes a look back through 75 years of US Air Force aircraft. The second, below, features the 40 years of aircraft that came first. (No disrespect, of course, to the many pilots of the US Navy. Here, though, we're focusing on the branch dedicated to air superiority.)
Before 1947, the precursors to the US Air Force went by many names. It all began with, of all things, the Army Signal Corps. In the earliest years of powered, heavier-than-air aircraft after the Wrights flew at Kitty Hawk, people looked to flying machines – balloons and dirigibles included – as observation platforms more than as weapons.
Here's how the organization's naming went over the years before Washington created the US Air Force: the Aeronautical Division (1907-14) and the Aviation Section (1914-18) of the Signal Corps, the Army Air Service (1918-26), the Army Air Corps (1926-41) and the Army Air Forces (1941-47).
The Aeronautical Division began its operations on Aug. 1, 1907. Two years later, the US government formally accepted a Wright Flyer at a price of $30,000 and designated it Signal Corps Airplane No. 1.
New aircraft just keep on coming. The Air Force is now looking ahead to the B-21 Raider, a next-generation bomber that on paper bears a strong resemblance to the existing B-2 Spirit bomber. The service is trying to think well into the future, saying the B-21 will be the "backbone of the future Air Force bomber force." It will work alongside the latest versions of the long-serving B-52, while the B-1B is being gradually retired.
The B-21 is now in development at Northrop Grumman. In May, the defense contractor completed a first round of tests, calibrating instruments and verifying structural integrity for the first B-21, part of the ground testing before the eventual first flight. The company said it has six aircraft in different stages of production and testing.
The Air Force projects that the first flight of the B-21 Raider will take place in 2023, and it expects the first wave of the planes to be operational in the mid-2020s. It projects spending about $20 billion over the next five years on production of the B-21, plus $12 billion on R&D, but it hasn't specified how many planes that equates to.
Back in 2016, the Air Force was eyeballing a minimum of 100 of the B-21 aircraft once production gets up to full speed.
While the generals, bureaucrats and politicians sort things out, the pilots will be out there doing their thing: flying.
Here's Yeager on the nature of the hot-shot pilot. It was 1954, and he'd just gotten to test a high-performance Soviet MiG-15 delivered by a defector, which he was comparing to the Air Force's F-86 Sabre.
"Yeager had to chuckle. Some things never changed," Tom Wolfe wrote in The Right Stuff. "You let any fighter jock talk about the enemy aircraft and he'll tell you it's the hottest thing that ever left the ground. After all, it made him look just that much better when he waxed the bandit's tail."