I agree that background information is necessary when modelling any historical subject. The ignorant may carp - particularly the wilfully ignorant - but many of us prefer to keep learning things all our lives. If you stop learning your brain dies, then you do.
I wish you had included a little more detail on some of the aircraft used on D-Day. I don't have my issue in front of me so correct me if I'm wrong, but I don't recall much about the heavy glider, the Airspeed Horsa, or the Short Stirling which served as glider tug and paratroop transport.
I realise your magazine is published in the US, but please remember that some of your readership is from other places. I first read your magazine in New Zealand and I am now living in Canada for a while. More than 20% of the allied troops on the ground on D-Day, as well as airmen and seamen, were neither Americans nor Brits. There were a very large number of Canadians (they were the main force that landed on Juno Beach and the only force to achieve ALL their objectives on the first day), plus substantial numbers of Poles and Free French in the ground forces. In the air and in the Channel there were significant numbers of those nationalities, plus Czechs, Dutch, Norwegians, Danes, Australians, New Zealanders, South Africans, and others. Once in a while it might be nice to see something about that, plus the Canadians, Kiwis, Indians, Poles, even the Brazilians etc in Italy; the Chinese armies of the Kuomintang and the Communists; the Brits and Indians keeping the Japanese out of India; the Mexicans in the Philippines; the Aussies, Kiwis, Poles, South Africans, Free French, Greeks etc alongside the Brits in North Africa; the Aussies, Kiwis, West Africans French and Dutch etc in South East Asia; the Aussies and Kiwis in the Southwestern Pacific; the Fijians in the Solomon Islands; the Canadians in the Aleutians; the Brits and Indians in Ethiopia; I could go on for pages... The modelling possibilities for doing something interesting and quite literally unique are almost endless and these are just the Western Allies.
The Soviets were not just Russians, but people from all those now-independent republics which have since broken away. They also had Polish formations, Free French airmen and various groups from other parts of Eastern Europe operating alongside them, plus American and particularly British Air Force formations operating from Russia at various times. Then there are the Arctic Convoys.
The Germans had allies too: the Italians and the Finns, Romanians, Hungarians, Slovaks, Croatians, Latvians, Lithuanians, Estonians, Bulgarians and White Russians, Ukranians and Cossacks, plus the Spanish Blue Division and volunteer SS formations of Norwegians, Dutch, French, Belgians Danes and Indians. Even the Japanese had the more or less reluctant co-operation of the Thai forces plus Burmese and Indian volunteers.
A little research will give a mind-boggling supply of potential subjects for armour or aircraft markings or for never-before-seen dioramas. Look beyond the many-times repeated GI versus Kraut, the Tommy versus Fritz, the leatherneck versus Jap, the Sherman or Churchill, Panther or Tiger, or T34, the P.51 or Spitfire, Fortress or Lancaster, Bf 109 or FW 190, Ju 88 or Me 262. It's all been done, folks. Sure you can do a variation on a theme, another permutation, but why not try something really different, something unique: Ghurkas versus Italian Blackshirts outside Addis Ababa, Soviet Mongolians versus Japanese on the Mongolia China border, or a Romanian IAR 80 on the Russian Front, a Thai Oscar, a Finnish or Yugoslav Hurricane, a Soviet Spitfire, a Bulgarian or Hungarian 109, a Vichy French Dewoitine D.520 in Syria. Anything, something. Look it up!
Research is the other side of modelling. It keeps modelling from getting into a rut of technically better and better models of the same old same old. Why not keep expanding your knowledge of subjects at the same time as you expand your knowledge of techniques. All the above variety is just the tip of the iceberg of Second World War subjects. There is a staggeringly huge lot of before and quite a bit of after that. The first figure diorama I did when I was a teenager was a post-Roman British horseman slashing down at a crouching Saxon. Later subjects included the Maori Land Wars in 19th Century New Zealand, Japanese mercenaries for the Spanish in 17th Century Philippines, Spanish and German adventurers in 16th Century Colombia and Byzantines versus Bulgars.