How do I boost my packet to be more competitive for the Environmental Science/ Engineering Officer program?

My community is specialized and I was a senior Accessions Officer on the side when I was doing my Skipper jobs. If like our Service, there's a short and long program to skate. Make sure your application doesn't have any punctuation, spelling, or grammer busts like the one in the first sentence of your post. Make sure your degree actually meets the physical or biological science degree requirement and any accreditation aspect. If you do this stuff right, then you should get the attention an accessions type who either recommends or decides (usually juniors recommend). Paper is one thing. Your appearance and mouth is another. The interviewer is trying to decide if you're worth the time and investment and have a high likelihood of success through the O-4 board. They don't want to bring people in who won't be hanging around. Shortages is a double edged sword. Good people who get in have some dirtbags as their peers and are often stuck with cleaning up their mess. Sitting junior and senior promotion boards taught me that my community works very hard to get great people in only to send some of them home 10 years later. The Reserve side gets them which means the officer who was always a reservist may be at a disadvantage at the O-4 and above boards. Nature of the beast. If you are interviewed, your demeanor needs to be about serving, learning, and always moving forward. Officers need to be good communicators (Senior NCOs too!). That's the consistent theme of the candidates that got my stamp of approval.

HAZMAT off the top of my head. Courses like that.

Because there is a shortage of ESOs in the Army...and coupled with your degree is PH with EH, I'd say your chances are pretty damn good.