You will find out towards the end of boot camp when you get access to your NSIPs account and your orders. ATI is the longest A school of the 3, around 6-7 months, ATO and AE clocks in around 2-4 months if I remember right. About C school, that's just a crap shoot, depends on your detailer, depends on your command, blah blah.
ATs can be pretty much anywhere, besides the cool places like Italy. ATOs will be with squadrons, ATIs will be on carriers and LHDs and FRCs or AIMD.
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