The video clips and the song lacked cohesion particularly in the first half. For example, I think it would be better if the upbeat section of the song featured more clips that showcase a bunch of different ships, convoys, bombers, etc. in a peaceful setting (without any fighting going on). Also, some clips of the pilot and sailor at their homes felt a bit out of place.
But honestly, you did a great job considering that you don't have much freedom when working with pre-made clips, and the video was made with just a few hours worth of work. The synchronisation between the song beats and the clip transitions was really well done.