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In 1982, the Tacit Blue flew for the first time in a test flight, and after that it flew 135 times over 3 years. The entire program cost $165 million and Northrop, as the main contractor, received $136 million. The data collected from the Tacit Blue project was later used on the B-2 Spirit, also made by Northrop.
The B-2 Spirit costs a record of $570 million per plane, so only 20 B-2's were built. The B-2 is a stealth bomber. One B-2 could complete a bombing raid which previously required 32 F-16s, 16 F-15s, and 27 support aircraft. It gets its stealth because it is a flying wing, complete with all the minor measurements and calculations to make it virtually invisible to radar, making it invincible to enemy defenses. It can also carry a pretty heavy bomb load. Basically an infinitely better plane then the Tacit Blue.