 The second-highest-scoring UN ace, Maj. James Jabara, was the first UN jet-vs.-jet ace.Another ace, Frederick C. "Boots" Blesse, claimed nine MiG-15s in his F-86 Sabre and later wrote "No Guts, No Glory", a manual of air fighter combat that is still studied today.James P. Hagerstrom claimed 8.5 kills.