Hello, all. I'm going to my AIT for the Army soon which'll be about 16 weeks or so (4 months) I got about $3.5k and I plan on keeping out about $400 to $500 just incase of emergencies. What should I invest in with the rest of my $3k so it'll grow while I'm gone? I know about CDs and all a bit but I was wondering if there is anything better to help grow it? Thanks.