Nearly every hyperbaric chamber company I work with has a deal with the military that helps subsidize the cost of a new hyperbaric chamber.
To get a military discount one must have a military ID and must be approved by the manufacturer. Beware of companies that give 10% off on chambers and say this is the military discount.
Military discount is only applied to chambers and they are made slightly different than the non-military models. The military models usually have one window and each company I work with that offers the discount has one special chamber that is for those in the military.