The US military tartans are restricted to veterans and active duty members of the various branches, you might need to show a DD 214 to gain access to these tartans. MacDonald tartans are open to any person of the Clan, excluding Lord of the Isles Green, this is restricted to the Clan Chief and his family and can be used with special permission. Again in the US we are not bound by many of these restrictions due to 7/4/1776, but it is in our best interest to respect the clans and persons associated with the tartans.