Those are beautiful pens!
One word of warning: While they are for military personnel, IF military personnel have to travel by commercial air, it is highly likely that bullet pens can or will be confiscated, the persons may be detained and a possible body search as well. Please add a note with the pen to be careful with this and to place "Bullet" pens in checked luggage on commercial flights.
There was a discussion on this about a year ago. Some countries and some US airport screeners don't play around with even look-a-likes when it comes to weapon related items,