Congrats on the internship.
WC tickets for Germany are hard to come by. Most American fans who want to go do not have tickets--and I'm talking about people that have been to previous World Cups and have had their name in the ticket drawings at every stage of ticket sales, starting in February 2005.
Since you're going to be in Germany anyway, make sure that they're not enforcing the ID checks and try to buy scalped tickets if you're willing to pay for them. You should be able to buy tickets for some of the less prestigious matchups without too much trouble. If you really want to see the U.S., the Ghana game is your best bet. US/Italy tickets are almost impossible to come by and US/Czech Republic ticket demand is also very high.
There are also some on-line ticket brokers who will sell you a package at exorbitant prices. I'm not sure how (or if) they guarantee that you'll be able to get in, though.
Of course, a few people have reportedly been hooked up by friends who work for a sponsor company.