Answer:
Uhhh- well thats gonna be hard. Really depends on how old they are and how mature... if she is 8 and up then just tell them that you are gonna help your country and protect there rights. And tell them how much you love them! Don't promise them that you'll come back tho. Cus you don't know if you will. Just tell her that you'll try your best to get home safe and that no matter what you'll never forget her!!