I have it on very good authority that both the job fair and the M&G will increase your chances of being called. For example in my class all civilian new hires had accomplished the M&G. I suspect nearly everyone had both. For me, I did a M&G in Nov. 13, but waited on the job fair til late Aug 14, I was called almost immediately after the job fair.
If UA is where you want to be, try to get both.
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