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In page McDonnell Douglas F/A-18 Hornet:
"A 1989 USMC study found that single-seat fighters were well suited to air-to-air combat missions, while dual-seat fighters were favored for complex strike missions against heavy air and ground defenses in adverse weather—the question being not so much as to whether a second pair of eyes would be useful, but as to having the second crewman sit in the same fighter or in a second fighter. Single-seat fighters that lacked wingmen were shown to be especially vulnerable.[citation needed]