to decide to do something: to do something on purpose / to perform a maneuver, to carry out a tactical action / to decide on an opinion: to believe in an opinion firmly

enlistment in a military

to enlist in a military

the Japan Self-Defense Forces (JSDF) (consisting of the air, the marine, and the ground forces)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

(idiomatic) to make up one’s mind, to decide

(military) the Japan Ground Self-Defense Force

(military) the Japan Air Self-Defense Force