Reverse
勝て兜の緒を締めよ = 勝って兜の緒を締めよう
"After victory, tighten your helmet cords" i.e. even after a victory, prepare for the next battle and do not let your guard down.
昭和十二年度 - 1937
非常時日本- Emergency [time in] Japan
海軍大演習参加記念 - Navy Large Maneuvers Participation Commemorative