In practice, the resulting complexity of the system was so great that it often did not work, and flak troops came to distrust it. By 1943, the use of IFF in Germany was highly confused due to the proliferating number of radar units, Allied jamming, and the fear among the pilots that the Allies were using IFF signals to track their aircraft. Attempts were made to replace Erstling on several occasions, but the chaotic nature of the late-war signals efforts meant the favored FuG 226 Neuling never reached operational status.