If you want to be a bio-chemist your first step getting into it and going around all the other things is be a grunt for 2 or 3 years to show you want to be there. Then join an explosives division. This is the hard part. After about 10 or so years in an explosives company you'll have a 80% chance of working on biological weaponry. Either way as soon as you get into explosives you get to work with that kind of stuff.