Decisive Point Podcast podcast

Decisive Point Podcast – Ep 6-9 – Tim Devine and Jonathan Gerson – on “Restoring the Primacy of Army Mobilization Planning: Lessons from the Interwar Period (1919–41)”

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In this episode, Tim Devine and Jon Gerson argue that the US Army must restore the primacy of mobilization planning to prepare for the growing likelihood of a protracted large-scale war involving the United States. While the Army’s transformation initiatives have emphasized important tactical matters, Devine and Gerson call attention to critical strategic vulnerabilities associated with mobilization—one of the Army’s enduring core functions. They offer insights, identify challenges, and offer recommendations for contemporary leaders and practitioners by analyzing the body of thought on mobilization planning during the interwar period (1919–41) and drawing connections to the present day.

Keywords: mobilization, strategic planning, large-scale war, readiness, Interwar Period

Stephanie Crider (Host)

Welcome to Decisive Point. The views and opinions expressed in this podcast are those of the guests and are not necessarily those of the Department of the Army, the US Army War College, or any other agency of the US government. Today we’re discussing national mobilization.

While the United States military pivoted to an era of great-power competition years ago, the strategic environment continues to evolve. Joining us remotely today is Lieutenant Colonel Tim Devine, an active-duty Army strategist, author of “Restoring the Primacy of Army Mobilization Planning: Lessons from the Interwar Years, 1919–41,” which was published in the Summer 2025 issue of Parameters. He has strategic planning experience on the Army Staff and in the Indo-Pacific and is currently an instructor at the Army’s Command and General Staff College.

Tim, welcome.

Tim Devine

Thanks, Stephanie. It’s a pleasure to be here.

Host

We’re also joined by Colonel John Gerson, a Title 10 National Guard officer and senior planner at the National Guard Bureau. He brings experience from several key assignments in the Joint Staff, the Army War Plans Division, the office of the Secretary of Defense (now Secretary of War), and the Guard Bureau.

John, thanks for joining us.

Jonathan Gerson

Thanks, Stephanie. Thanks for inviting me on. It’s always great to share the mic with Tim.

Host

Tim, your article is the foundation for our conversation today. In it, you argue the Army must restore the primacy of mobilization planning. To start, could you summarize why you believe looking back 100 years to the interwar period is so crucial for the challenges the Army faces right now?

Devine

Absolutely. And first, I’ll emphasize that I’m a practitioner. I’m not a professional historian, but I was struck just by how much of this history is relevant for our contemporary time. Right after World War I, it was really the last time that the Army had to build a mass mobilization model almost from scratch. And World War I mobilization was chaotic and, although it was ultimately successful, there was a long list of shortcomings that illuminated the need for systematic reform.

And, this experience had a profound effect on those who took part, particularly those in the Army who later held prominent roles throughout the interwar years—so, Chiefs of Staff like [General] John [J.] Pershing, General [Douglas] MacArthur, [General Malin] Craig and, of course, General George [C.] Marshall. And, each of them advanced proficiency in strategic planning in their own way.

Now, fast forward to today, and there’s a lot that we can apply from this period. And, even during my time in uniform, which is approaching the 20-year mark, I’ve lived through the Army’s shift from the two decades of counterinsurgency to renew the focus on large-scale combat—or LSCO, as we call it. And given this shift institutionally, it’s clear that the Army is wrestling with how to prepare its forces for the growing likelihood of these potentialities.

This impacts everything—how the Army organizes itself, how we train our forces, how we equip them, how we measure readiness, and how we view and anticipate the character of war changing. There’s a lot of credible sources out there that have expressed the fact that there is a growing chance for large-scale conflict involving the United States. And, I know that’s a sobering aspect of the conversation today, but that reality emplaces an important demand signal on the Army. And, that demand signal is not only to fight the nation’s wars—fight and win the nation’s wars, rather—but to generate the force needed to do so. And, of course, these two things go hand in hand, but today’s discussion will focus on the latter.

And, I want to stress, too, that the force I’m talking about—the war-winning force—in all likelihood, far exceeds what we have today. And I’m not just talking about the active component. This includes the reserve component, which consists of the Army National Guard and Army Reserve. So, in other words, there must be a plan for generating the right mix beyond the force in being, and that could be difficult to imagine. So, the interwar period offers us a blueprint, not for perfect solutions, but of the intellectual journey needed to prepare.

Host

You mentioned the Army developed a planning ecosystem to tackle this challenge. What did that look like?

Devine

Overall, it was a network of institutions and processes that was really meant to build intellectual capital. And, through this ecosystem, the Army learned to speak the language of national mobilization. And, to me, that’s really the biggest takeaway that I gained from studying this period. And, during my research, a colleague of mine recommended I read Henry [G.] Gole’s book titled The Road to Rainbow.

And, I’m sure that title is familiar to many of your listeners, but for those that are not familiar with this, Rainbow, of course, refers to the famous Rainbow Series plans. These replace the so-called Color Plans that were, as one Army historian put it, “little more than abstract academic exercises.” But, to get us to an integrated set of plans, Gole explores this ecosystem—the planning ecosystem—created by the Army, which consisted of four pillars.

First was professional military education. The second was practicums—think like war games and exercises and so forth. The third was studies, and the fourth was continuous planning. There’s really a lot I could go into about Gole’s work, but just given that we’re constrained on time here, I’ll focus my comments about the cumulative effect of it all—so, the formal education, follow-on assignments to the War Plans Division, [of] which Colonel Gerson and I are proud alumni, constantly writing and rewriting these plans.

All of that proved invaluable. And, while the plans themselves were riddled with flaws, especially the early plans during the 1920s, it was the process, really, that revealed not only the problems’ immense complexities but also the extraordinary scope. So consequently, over time, the plans got better and, eventually, they linked force-generation requirements to operations envisioned by the regional war plans. They drew connections between the two chief commodities, which I like that term. It’s one I borrowed from the readings that I found during my study—the two chief commodities, the mobilization, manpower, and materiel. And, the assumptions became more realistic. The calculations got better. So, when war finally came, this intellectual capital gain from these integrated planning frameworks was arguably the most valuable strategic asset that the Army had.

Host

Your article highlights significant disconnects during that period between manpower and materiel plans and between defensive assumptions and offensive war plans. Do you see similar gaps today?

Devine

I do, and I touched on this briefly, so I’m glad you’re giving me a chance to unpack the idea further. For me, during my study of the interwar years, it illuminated how important those connections are. And, I’m talking about the connections between the interrelated parts of an immensely complex system that we call national mobilization. So obviously, many of these parts, like supply chains, for instance, transcend the Army, but they’re all related.

[The] first point I’d like to make is [that we should] consider these two basic commodities that I mentioned earlier, manpower and materiel. And, the World War I mobilization experience was really a failure to synchronize the two. I mentioned it was a success in the long run, but this is one of the big points that came out of it. And I really like the quote from Arthur Herman, who’s the author of Freedom’s Forge, to illustrate this point.

And that’s another title many of your readers are probably familiar with. So, Herman writes “[Of] the 10,000 75mm artillery pieces the War Department ordered, only 143 ever reached the front—and not one American-made tank.”

So, interestingly, the disconnect between manpower and materiel planning remained prevalent throughout the 1920s and into the 1930s. And, it’s easy to see the flaw here, but I assure you that planning stovepipes are still alive and well. The second point [is] throughout most of the interwar period, there was a huge disconnect between the concepts guiding the mobilization plans and those for the regional war plans. So, the mobilization plans were based on defensive concepts like hemispheric defense, whereas the regional war plans like War Plan Orange were offensive.

So, in other words, if the Army had to fight War Plan Orange, there was not a corresponding mobilization plan to generate the force needed to do so. And those that know their history here, the Army of the interwar years was a Spartan-sized, poorly equipped force that really couldn’t handle any contingency scenario, let alone any...

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