In this episode of Conversations on Strategy, retired Lieutenant General Robert L. Caslen Jr. and historian Dr. Katelyn K. Tietzen-Wisdom discuss Caslen’s 2025 book, The Impossible Mission: The Office of Security Cooperation and the US Forces Drawdown in Iraq. The conversation explores the strategic challenges of the 2011 US drawdown in Iraq. The discussion highlights the complexities of war termination, highlighting the need to learn from the gap between policy expectations and on-the-ground reality.
Keywords: War Termination, Iraq Drawdown, Military Strategy, Security Cooperation, Robert Caslen
Stephanie Crider (Host)
You are listening to Conversations on Strategy. 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.
I’m talking remotely with Lieutenant General Robert L. Caslen Jr. (US Army, retired) and Dr. Katelyn K. Tietzen-Wisdom.
Caslen is a United States Military Academy honor graduate, a veteran of 43 years, and the author of The Impossible Mission: The Office of Security Cooperation and the U.S. Forces Drawdown in Iraq, published by Outskirts Press Incorporated in 2025.
Tietzen-Wisdom is a historian at the US Army Center of Military History in Washington, DC. She wrote a Parameters book review about The Impossible Mission.
Welcome to Conversations on Strategy, General Caslen and Dr. Tietzen-Wisdom.
Robert L. Caslen Jr.
Alright. Thank you.
Katelyn K. Tietzen-Wisdom
Thanks for having us.
Host
General Caslen, what inspired you to write this book?
Caslen
Well, you know, first of all, for the over 8,000 men and women from the United States military that gave their life for the country of Iraq and for its development and for what it potentially can be in the middle of a very hostile area in the Middle East, you know, we owe it to their service and their sacrifice. That’s number one.
Number two, I think there’s just tremendous opportunity for what Iraq can become and its impact, not only in its own country, but also for the Middle East. And it’s a very rocky road to get there. And, we talk about going to war, and there’s a lot of books written about going to war and more, but there’s not that much written about terminating a war, and the challenges—not only the policy decisions, but the challenges to develop the right strategies based on what the policies are and how to get congruence across different United States government departments, you know, because everybody has their own vision. So, who’s got the responsibility to bring it together to get a unified vision of how that drawdown proceeds?
And then, it just doesn’t happen by leaving. People think that leaving a war terminates a war, and there’s so much complication. And, those that remain to kind of pick up the tasks that are still outstanding—like foreign military sales—they rely on authorities to be there and immunities to be there that come from Congress and from elsewhere. And, all of that has got to be put together. Someone’s got to put that strategy together across departments of the United States government, and it didn’t happen. So, we were the ones that experienced it during the drawdown and the aftermath. I ended up staying there for 22 months. So, it was a huge challenge, but there were so many significant lessons, strategic lessons, that needed to be learned so that when we go to the next war termination, we can do it properly.
Afghanistan was the next one, and you can just look back on recent history [and assess] whether we learned anything from Iraq or not, but there’s still a lot to be learned. So, that’s why the book was written.
Tietzen-Wisdom
And, if I can jump in, as a historian, I’m eternally grateful that General Caslen wrote this book because, like he said, this time period is kind of overlooked. There’s the invasion, the insurgency, civil war, and then it’s “boop!”—the US Army is out of Iraq, and we’re back into Afghanistan. And this book, for historians, is just [a] treasure. Having this primary source from somebody who is not only there—multiple times in Iraq—but there at a pretty decisive point, it’ll help advance the scholarship of the Iraq War and not only honor those veterans and the servicemembers, but [it] will help inform future policy and strategy.
Host
Let’s start by talking about where things went wrong. Where do you think the mission truly became impossible and were the obstacles structural, political, or self-inflicted by the system?
Caslen
Well, interestingly enough, General Lloyd Austin was the MNF (Multi-National Force) commander on termination, and he’s the one that departed. He hired RAND Corporation to come in to try to capture some of the historical narratives of the war termination of what took place within MNF-I (National Force-Iraq).
As RAND was thinking about what was going to happen next with the OSCI (Office of Security Cooperation in Iraq) coming in, which I was the commander of, they knew that there were so many areas that still had to be resourced that were not. And, their comment of it, not mine—I didn’t come up with the name or anything like that—their comment in their book was, “What Caslen inherited, it was impossible. And he has an impossible mission.” And that was a perfect title for the book, I thought. So, not Mission Impossible or whatever. It’s The Impossible Mission, and it’s not something I came up with but something I felt very closely, you know, trying to bang my head against the wall because there were some impossible things that were going on out there. But RAND Corporation was the one that came up with that name, and having lived it and experienced it, it really was, if not impossible, about as close as you can get to being impossible.
Tietzen-Wisdom
I think, important for this time period, too, is that the US is facing a deadline that was imposed three years earlier, if we’re talking about towards the end of 2011 with the Status (of Forces Agreement), the SOFA agreement, as it was colloquially referred to as a security agreement and a cooperation agreement. But, the US has to withdraw all forces no later than 31 December 2011. And there was questions of whether the US would be able to stay or not.
Whether this was an impossible mission, I think there’s multiple layers to it, but one of the driving factors for why General Caslen was facing all of these headaches was, in my opinion, I think the United States underestimated the Iraqi political sphere that, for many Iraqis, US forces, no matter [their] intentions after, were seen as occupiers, and there was a US occupation. And so, any Iraqi politician that was willing to sign off on an extension that would have allowed US forces to stay beyond 2011, that was pretty politically fraught to contend with.
I also would argue that a lot of Americans, both in Iraq and in the Pentagon or in [the] State Department, believed that the Iraqis would ask for an extension, and there was this kind of complacency [implying,] “Oh, well, this will happen.” And General Caslen talks about in his book, he arrives in Iraq in September 2011, and he’s told by some pretty powerful policymakers on the ground that “Oh, yeah, this will work.”
And I think, too, that Iraq, in general, kind of gets caught up in this new change. There’s a new administration in [Washington,] DC. They’re shifting priorities to Afghanistan, and it’s almost like Iraq kind of became on the back burner. And General Caslen and his team are left trying to put these pieces together as there’s changing personnel, [changing] focus, there’s Iraqi politics [that] is becoming more and more independent and assertive. And so, I don’t know if there’s one specific issue that made it impossible, but there was just a lot that General Caslen’s team had to contend with.
Caslen
You know, as I was doing my research getting ready to deploy to try to find what my mission and my responsibilities were going to be, the national security objectives that General Austin had in MNF-I (Multi-National Forces-Iraq) were the exact same national security objectives that I inherited. General Austin had 50,000 soldiers. I had 157. So, when you just stop and look at the math based on your national security objectives that were given to you, how in the heck are you going to accomplish the same national security objectives that 50,000 soldiers had a hard time accomplishing, and now you’re going to do it for 157? And, that’s when RAND (Corporation) looked at that thing and said, “This is impossible,” you know?
But, there was a there was a lot of thinking in Washington, DC, that there was going to be a significant residual force—similar to what took place in Korea after the 1953 [armistice] out there in South Korea. You know, they had a couple divisions that stayed there, and they still have a division headquarters over there, you know, even to this day, some 60 some years later. So, a lot of people thought that if you’re going to secure those national objectives and continue them that you’re going to have to have some sort of residual force.
But, there were some people that were arguing in support of it. There were even people in Iraq that were arguing in support of it, but the conditions that were set by the United States government was that you had to have a security agreement and a SOFA agreement—two separate agreements—where the security agreement allows you to be there, and the SOFA agreement gives you immunities. And both of them exp...