E.R. Campbell said:
I also think this is another "creeping Americanism" and, in my opinion, an unwelcome one. There are appropriate times and places to honour our dear ~ dinner is not, again in my opinion, one of them. It seem to me that these maudlin displays actually cheapen the supreme sacrifice.
In some regiments and corps it was customary, usually at the regimental birthday type dinner, to add a toast to "absent friends" or something like that; it wasn't a universal custom. (But I remember being impressed, moved, at a dinner night in a German Panzer-Grenadier unit when, at the end of the meal, the subalterns stood and sang (chanted?) "Ich hatt' einen Kameraden". I was also somewhat surprised as I, mistakenly, associated it with the Nazis; my host explained that it was a very old, old dirge or lament and, while not heard often after WWII, was quite "proper" and some COs, he included, allowed it, now and again, on special occasions.) But I never, in dining with several armies (and navies and air forces, too), in e.g. Australia, Britain, Germany, India, Netherlands, New Zealand and Singapore saw this custom, or anything like the empty table or empty place, except in the USA.