I'm not really an expert on Armenian Soldiers during World War 1 but I can shed a little bit of light on this situation, hopefully someone with more in depth knowledge will come along and give a more in depth answer. The information I have here is what I remember from a book (I believe it was written by Richard G. Hovannisian) on the Armenian Genocide.

So the Armenian soldiers one might expect to find fighting in World War 1 would likely be fighting under the Russian Army as irregulars who were used in the fight against the Ottoman Empire but later in the war (after the Tsar's abdication) they were formed into an Armenian Army. These troops were, as I mentioned, irregulars and their dress and armaments reflected this as you'll be able to see here.

You can see that some of these soldiers have knives and ammo belts in abundance. The way these soldiers are armed is similar to the style used by the Armenian Fedayees (militia or self defence units) who can be seen here. I'm aware that this doesn't fully answer your question but you can see why Ernst Junger might describe an overly armed soldier as being like an Armenian.