-/+support
My view is basically the same as Jummy's, you clearly put a lot of effort into this app and seem to be a good guy (especially since a High Command vouched for you) but your rank is, as Jummy said, a bit too low to be applying for something like Guardian. You would absolutely get the position with the same exact application later on when you reach a rank like SSGT or higher in Nu7, as being an NCO in security is a good mark, but Guardian is much more like MTF than security, so you would need more experience in MTF or perhaps even become a Warden.
If this is denied, don't let that discourage you, I'm sure that if you apply further down the line after you advance in MTF a bit with the same points in your app, you'll have no problem getting it.
~RRH Engineer Sierra 7