How to install a NATO Strap on your watch.
First, you need to make sure you have your old strap removed but the springbars in.
Next, you unloop the NATO strap from the loose keeper like so ...
... and feed it through the top springbar ...
... like so.
Continue looping the loose end through the bottom springbars, coming out at the front of the watch.
As you can see, this is now looking like it's installed.
Loop the loose end through the bottom keeper ...
... to bring the whole thing together.
This is now complete. The watch is installed on the strap.
Put the watch on your wrist as you would a normal strap ...
... feeding it through the first top keeper ...
... and then the second.
Then, fold the loose end back upon itself and push it under the top-most bit.
This keeps the loose end nice and secure.
No loose ends.
Wear it well.