bai, i have here some few choices...
...if you want a balanced leadership-mental-physical challenge try joining the Philippine Military Academy.
...if you want an intense infantry leadership try joining the Philippine Army Officer Candidate Course.
...if you want a heart-pumping life try the Philippine Air Force Flying School...but sad to say it has been dissolved recently and no longer accepting external students.
...if you want to fight in the front lines of the battlefield join the MARINES.
...if you have the guts to live in the water join the NAVY. our country is an archipelago, water is everywhere.

...if you want to be an "unconventional" warfare specialist...join the SCOUT RANGERS, the ARMY SPECIAL FORCES, the NAVY's S.W.A.G.(our version of the U.S. Navy SEAL), the Air Force's S.P.O.W.
the choices don't end here... you are free to choose...but in whatever endeavor you want to belong, you need the mental-physical preparation to engage...and of course the "will-power".
Mathematics is essential in every job, both Military and civilian, even to the jobless. but being in the military you also need to be flexible, decisive, precise, and should have the initiative. Bravery is usually associated with the military men but bravery without the initiative is a dead soldier.

Good Luck,