It is hard to grasp an understanding of how much we spend on military spending. Below are some resources on how much we spend and what we can use that money for instead.
Since you can’t provide all the information in a 3-5 minute video, try to narrow your focus and maybe suggest how your audience can learn more.
About Military Spending
Lobbying of Defense Contractors video (2 minutes)
Youth Advocacy on trade offs video (3 minutes)
One Day of the Iraq War (video 2 minutes). From 2008 but interesting approach