Clearly, you can tell from that old movie that the E.D.O was heavily dependent on primarily the German Leopard I (from Arnold 4970), Leopard II (e.g. Roco 25595 or Herpa 741880), and even the M109 mechanized artillery (Roco 25596) seen below with their standard transport vehicle, the E.D.O. Class 47 (Minitrix!) While these machines were able to successfully fend off threats in the old days, they have begun to show their age and its time to modernize E.D.O. and prepare for new threats our planet will face!
Pendraken, which are in the 10mm scale as well (site lists this as 1:150)! But as you can tell, when placed alongside a typical N Scale car, the scale looks about right!
Reaper Wolverine (07091) which is part of the "CAV" war-gaming universe and is in fact referred to as N Scale. The Wolverine, shown below next to a Porsche, very much appears to be a heavy battle tank!
Now in the works are a couple of new vehicles: a "Ballista" rocket launching vehicle from Dream Pod 9's Heavy Gear Blitz line (which is in the 'close enough' 1:144 scale) in addition to the Hawk WarGames model of a "Kodiak ACV" from the Dropzone Commander war-gaming line (these are 10mm scale models, which seem pretty close to 1:160).