Early reports indicate that the pilot of a US F-15 fighter aircraft downed over Iran was rescued - which, if confirmed, would be the latest in the long history of US combat search-and-rescue missions over decades. The search operation is ongoing deep inside Iran for a second crew member, according to CBS, the BBC's US partner. Combat search and rescue, or CSAR, missions are considered among the most complex, time-sensitive operations that US and allied militaries prepare for. In the US, elite