The style of the music video is shown through the use of narrative and lyrics interpretation. This allows the audience to interpret their own meaning about the song. It has the use of lip sync and 'As Live' footage. All of these have been done to show the audience that somehow even during war, soldiers still manage to hold on to that small grasp of hope that keeps them believing that they will return home safely. Many people are able to relate this, especially as there are quite a lot of soldiers fighting for our country in wars all around the world in today's society. The medium close up shot of the soldier looking deeply into his girlfriends eyes quickly switches to him killing the soldier, this has been done to show the audience that in fact after having experienced killing they can quickly change, as it is shown by the anger on the soldier's face.
This is a screen shot referencing to the point about the Medium close up of the soldier's, this is showing the anger he feels - representing to the audience that this how going to war can change a person.
Here is the music video for Fun - Some Nights