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Sonic the Hedgehog [a] [1] is a blue anthropomorphic hedgehog and the main protagonist of the series. Developed as a replacement for their existing Alex Kidd mascot, as well as Sega's response to Mario, his first appearance was in the arcade game Rad Mobile as a cameo, before making his official debut in Sonic the Hedgehog (1991).
The U.S. Army's Abrams tank doctrine was influenced by German, British, American, and Soviet ideas. The German concept of Auftragstaktik (English: Mission-type tactics), a military doctrine emphasizing decentralized decision-making, and Schwerpunkt (English: Main point), the massing of resources around a focal point, were influential.