I do not want to admit that the next World War is actually happening but the fact is that with technology connecting the globe if something happens over 4000 miles away we know it and want to respond.
That said nearly 70 years ago it took an exceptional amount of time for events to affect us in the US and then there was a draft where volunteering was something you did because you would go to jail otherwise.
Today, civilians need to support those whom served our country. Finding opportunities can be a bit of a catch-22.
Check out MilServe.org a database of where you can find an opportunity to help those whom served in our military.