Soldier Girl (1)

Location: Kaihin Makuhari, Japan

Yes sir!

了解です！

ryoukai desu !

How to say YES in Japanease

了解 ryoukai is mostly used to answer usually when you are ordered to do something by your boss, captain, leader, etc.
了解 ryoukai translates as affirmative in English. In normal conversation, it is just weird to say affirmative, don`t you think?

When you are talking with friends and family, a simple
分かりました wakarimashita 
分かった wakatta
will suffice.