[color=#FFFFFF]First, it can be used only in dogfight, in other words short range agile missiles, think the Sidewinder. However the sidewinder is a heat seeker. There isn't much heat to track in front of the aircraft don't you think?
Secondly it doesn't have unlimited fuel, and if it's launched backwards it will drop down with the same speed as the fighter hence its engine has to stop it from going forward with its arse first and then accelerate it towards the enemy plane. No to mention that it will pass through the jet wash if it engine activates close to the fighter
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