Need help with some Navy acronyms?

I'm looking at some websites that talk about enlisting incentives. I have the bluejackets manual which answers most questions but there are a few acronyms that I cannot find an answer for. 1. IS-ATF: I know IS is intelligence specialist but what is ATF? 2. IS-SG: Again I know IS but what is SG? 3. I also... show more I'm looking at some websites that talk about enlisting incentives. I have the bluejackets manual which answers most questions but there are a few acronyms that I cannot find an answer for.

1. IS-ATF: I know IS is intelligence specialist but what is ATF?
2. IS-SG: Again I know IS but what is SG?
3. I also notice the acronym AEF?

Please provide what those acronyms mean. Thank you all for your time and answers.
Update: EDIT: Thanks for the AEF and ATF info. But what is SG mean?
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