After more than four decades in service, the A-10 Warthog is due for a replacement. So says the U.S. Air Combat Command. What's more, ACC says it's already "thinking about" fielding such a replacement. But what might that replacement be? Last week, we got a clue. As reported by Reuters, the Air Force has recently begun evaluating Textron's Scorpion fighter jet as a potential 21st-century replacement for the 20th-century Warthog.