Over the last century, one of the apparent constants in military doctrine has been that the latest and greatest technical innovation has somehow eclipsed the importance of boring old infantry units. Tanks were the future! No, tactical airpower was the future! No, nuclear weapons were the future! No, airmobile and helicopter units were the future! No, drones are the future! Yet every time the guns started firing, the limiting factor always seemed to be “not enough infantry” (at least among western militaries). You definitely needed more specialist and support units to handle the latest whizzy toys being deployed, yet it was still the infantry who mattered in the end. That’s just me noodling … it’s only loosely related to the rest of the post.
In my weekly recommendations list from Substack, they included this post from Bazaar of War which discusses the changes in organization of tactical and operation level units over time to best meet the needs of the modern battlefield:
Command post for a single battalion-sized element in a brigade combat team.
Photo by Sgt Anita Stratton, US Army.
Modern ground forces are torn between two competing demands, for infantry and for enablers. Urban operations and large-scale combat over the past decade demonstrate that infantry remains just as essential as ever. Yet that same infantry needs a lot of low-level support just to survive and remain effective: drone operators, EW, and engineers, not to mention armor and artillery. This poses an obvious dilemma for force management—not least when faced with competing demands for air, naval, and missile assets—but also raises questions about force structure.
Organizing the Force
One of the key decisions in how future wars will be fought is what will be the primary tactical unit. Inevitably, certain command levels are much more important than others: those which require greater freedom from higher headquarters than they allow their own subordinates. This partly comes down to a question of where the combined-arms fight is best coordinated, which in turn depends heavily on technology.
This has varied a lot over time. The main tactical formation of the Napoleonic army was the corps, which had organic artillery, cavalry, and engineers that allowed it to fight independent actions with a versatility not available to smaller units. The Western Front of World War II was a war of divisions at the tactical level and armies at the operational, a pattern which continued through the Cold War. The US Army shifted to a brigade model during the GWOT era, on the assumption that future deployments would be smaller scale and lower intensity; only recently has it made the decision to return to a divisional model. Russia also switched to a brigade model around this time, although more for cost and manpower reasons.
Tweaking the Hierarchy
At the same time, certain echelons have disappeared altogether. The subdivisions of Western armies reached their greatest extent in World War I, as new ones were added at the extremities of the model standardized during the French Revolution: fireteams/squads to execute trench raids, army groups to manage large sections of the front. At the same time, cuts were made around the middle. Machine guns were pushed from the regimental level down to battalions over the course of the war, reducing the number of these bulkier regiments in a division; this accordingly eliminated the need for brigades as a tactical unit.
This continued with the next major war. More organic supporting arms and increased mobility made combat more dispersed, creating the need for supply, communications, intelligence, and medical support at lower levels. As units at each echelon grew fatter, it became too cumbersome to have six separate headquarters from battalion to field army. Midway through World War II, the Soviets followed the Western example of eliminating brigades, and got rid of corps to boot (excepting ad-hoc and specialized formations). During the Cold War, the increasing use of combined arms at a lower level caused most NATO militaries to eliminate the regiment/brigade distinction altogether: the majority favored the larger brigade, which could receive supporting units to fight as a brigade combat team, although the US Marines retained regiments as brigades in all but name (the French, by contrast, got rid of most of their battalions, preferring regiments formed of many companies).
Private William Penman, 
