Dual of emotions

You joined the Navy a few months ago. Now you have become familiar with your surroundings, you've made friends; even have a best friend, Madden Carry. You guys were hanging out, training and such, before going to bed. Once you wake up the next morning, you notice Madden gone. Where did they go? After weeks you slowly forget about them, only to make a new best friend. After a day, you get sent into the battle field only to find you ex best friend, on the other end of the field.