field day

Noun

idiomatic Navy US specifically

(military) A day for manoeuvres and tactical exercises in "the field". / A school day for athletic events; a sports day. / A day of class taken away from school for a field trip.

Japanese Meaning

（軍事）野外での演習、操演や戦術演習を実施する日のこと / 学校での運動会や陸上競技などのスポーツイベントが行われる日 / 授業を休んでフィールドトリップや遠足を行う日のこと

What is this buttons?

The regiment prepared all week for the field day, ensuring vehicles and radios were combat-ready.

Google Translation / DeepL Translation

連隊は野外演習の日に備えて一週間かけて準備を整え、車両と無線機を戦闘態勢に整えた。

Details

Sense（1）

(military) A day for manoeuvres and tactical exercises in "the field".

This morning I got up, with great difficulty, at 6.30, and at 7.45 we started out for a Brigade Field Day. Did an attack from 10.30 to 2.30, but it wasn't a strenuous one for me as I was told to "become a casualty" soon after the 3000 yard assault began ….

Google Translation / DeepL Translation