College Admission after High School Graduation + Military Experience

I’m currently a senior in High School planning on pursuing the medical field in the future. At this point, I am confident that the medical area is my field of passion, so my goal is to get into the BS/MD program. My current stats:

SAT: 1560

Unweighted GPA: 3.9
Weighted GPA: 4.5

SAT Subject Tests/ Scores

  • Math 2 (800)
  • Biology (800)
  • Physics (800)
  • Chem (780)
  • Korean (800)

9 AP classes/ Scores

  • AP Calc AB (5)
  • AP Calc BC (5)
  • AP World History (5)
  • AP Chemistry (Taking right now)
  • AP Biology (5)
  • AP Physics 1 (5)
  • AP Physics C (Taking right now)
  • AP Computer Science Principles (5)
  • AP Gov (Taking right now)

Extracurricular Activities

  • Science Olympiad Regional Competition (3rd place)
  • National Honor Society (member)
  • Science National Honor Society (member)
  • Math National Honor Society (treasurer)

My current goal is the BS/MD program for Brown or Northwestern University. Unfortunately, as you can see, I lack extracurricular activities that show my interest in the medical field. Over the summer, I decided to sign up for the Army Reserve. In the military, I would work and train as a cardiovascular specialist for two years and continue to work once a month in a nearby military hospital when I return home. After working for two years in the military, I would return home and apply for the BS/MD program or traditional medical schools. What are my chances of getting into top-tier BS/MD program or medical schools in the country, such as Harvard, UPenn, Johns Hopkins, etc.) with the military experience?

Thanks!