The D-Day from “Saving Private Ryan” was filmed in 15 days using 1500 extras and lots of effort to make it feel almost as if we were there ourselves.

The factors by which countries were included to this list were numbers of troops, budget put into military, total machinery active (ground, naval and aerial), and both past records of battles and future plans for military development.

Here is a set of rare and interesting photos by Reuters, ranging from 2006 to 2015, that reveal an everyday life of North Korean soldiers.

The US Air Force is considered to be the world's first aerial power. Let's take a look at 39 distinct kinds of US military aircraft that are on duty.