US Typically posted victories below or near cockpit and there were variations in theatre and even among squadrons and individals
Navy's top ace in WWII and his personal choice of markings
Germans in WWII marked victories on the rudder
Galland's Me109
USAAF top ace Richard Bong put more emphasis on his wife than his kills
VF-17 Jolly Rogers preference for markings in the air
and on the ground
Israelis use roundels replicating markings of the victims
More Israeli F-15s showing successes in the air
Robin Olds racked up 17 kills in WWII and went on to score again over North Vietnam
ETO leading ace John C Meyer before the jeep wreck that pulled him out of contention
Gabby Gabreski's choice of markings in WWII in ETO
Leading Korean Ace Joe McConnell's F-86
http://www.af.mil/shared/media/photodb/photos/020925-O-9999G-005.jpg