The antonym of the word "de-militarizes" is militarizes, which means to equip or organize with military forces or to make something more military or warlike. Other antonyms for the word might include rearm, fortify, or mobilize, all of which suggest the opposite of dismantling military infrastructure or reducing the role of the armed forces. Alternately, terms like demobilize or disarm might be considered related antonyms to de-militarize, as they involve reducing or eliminating military power and weaponry. In general, the antonyms for "de-militarizes" point toward the idea of strengthening or expanding military capabilities, rather than scaling back or demilitarizing.