I just finished the Jungle Operations Training Course (JOTC) on Schofield Barracks, Hawaii. Like most Soldiers heading there, I expected to learn how infantry formations move, survive, and fight in one of the most unforgiving environments on earth: the jungle. JOTC is built around small-unit tactics, jungle patrolling, survival, and leadership under severe physical strain. But walking away from the course, I found it revealed something much bigger than infantry skills alone.
For sustainers, JOTC is not just an infantry school. It is a window into a problem our profession must confront more seriously. In the jungle, the final leg of sustainment, the last tactical mile, is no longer theoretical or hidden behind a logistics graphic. It is exposed in every pound carried, every slope climbed, and every bottle of water hauled forward –– and every assumption about support starts to break down under such highly restricted and challenging terrain.
The bottom line is that sustainers, especially those aligned with the Indo-Pacific, must go to Jungle School. JOTC does not just teach what jungle operations demand of the rifle squad; it shows what they demand of the sustainment enterprise. And the lesson is clear: if we want to support formations fighting in restrictive terrain, then we must think much harder about the last tactical mile, Soldier load, power generation, and what support really looks like beyond the road.
The Jungle Exposes the Real Sustainment Problem
In many operating environments, sustainment planning still assumes that vehicles can eventually close the distance. Trucks, trailers, fuelers, generators, and larger distribution systems form the backbone of support. Even when units move beyond immediate road access, there is often a belief that support can still push close enough to reduce the burden on the Soldier. The jungle breaks that model.
Under triple canopy, the final leg of sustainment is not simply longer but is more physically demanding, more time-consuming, and more tactically risky. Terrain degrades speed. Heat and humidity accelerate exhaustion. Vegetation constrains maneuver. Footpaths may be narrow, muddy, and barely navigable. Casualty evacuation, water distribution, battery replenishment, and ammunition resupply all become harder at precisely the point where they matter most. In that environment, sustainment becomes brutally simple: if a Soldier cannot carry it, drag it, or receive it through some alternative low-signature means, it may as well not exist.
That reality reframes the problem. The question is no longer merely how to move supplies from a support area to a logistics release point. The question is how to sustain combat power, endurance, and mobility in formations operating beyond roads, beyond vehicle access, and often beyond the practical reach of legacy support systems. The jungle forces sustainers to confront the last tactical mile not as a planning graphic but as a human problem measured in fatigue, time, and physical strain.
The Last Tactical Mile Becomes the Decisive Mile
JOTC reinforces a truth that sustainers cannot afford to ignore: the last tactical mile is often the decisive mile in the supply distribution chain. It is where logistics friction becomes combat friction. Water is one of the clearest examples. In any environment, water is essential. In the jungle, it is non-negotiable, yet heavy to carry and difficult to distribute. A liter weighs more than 2 pounds. Multiply that across a squad operating for extended periods, and water alone becomes a major factor in combat endurance. The same is true of batteries, ammunition, medical supplies, communications equipment, and sustainment items that appear manageable in a planning spreadsheet but become crushing when carried over steep, wet, vegetation-choked terrain.
At the squad level, this burden compounds quickly. Soldiers do not just carry their weapons and mission-essential gear. They often carry the cumulative inefficiencies of the larger sustainment system. When the Army lacks practical means to reduce, cache, air deliver, or otherwise decentralize support, the burden falls directly onto the Soldier’s back.
That has profound implications for sustainers. Too often, logistics discussions end at the point where supplies arrive at a logistics release point or company command node. Jungle operations demand a more honest question: what actually reaches the point of need, by what method, and at what human cost? If the answer depends on dismounted Soldiers carrying excessive loads over punishing terrain, then the sustainment design is incomplete.
The jungle does not care what was successfully pushed to a distribution point. It only cares what the Soldier can still fight with after carrying it.
Soldier Load Is a Sustainment Problem
One of the most important lessons from JOTC is that Soldier load is not merely an infantry challenge. It is a sustainment challenge, a force design challenge, and ultimately a combat effectiveness challenge.
The Army often treats the individual Soldier as the final flexibility measure in the distribution system. When packaging is inefficient, the Soldier carries more. When terrain becomes restricted, the Soldier carries more. When batteries are not optimized, water is not available forward, or mission command systems impose added demand, the Soldier carries more. Over time, the individual rifleman becomes the shock absorber for a system that cannot fully close the sustainment gap.
Jungle terrain immediately punishes overloading. Every additional pound reduces speed, increases fatigue, and raises the risk of injury. More importantly, it degrades tactical performance. The heavily burdened Soldier is less agile, slower to react, and more quickly exhausted. A unit can no longer separate its sustainment burden from its tactical effectiveness. They are one and the same.
That should force a shift in how sustainers think. Packaging, commodity forecasting, load planning, and last-leg distribution all must be assessed not just for throughput, but for what they demand of the supported formation. If the system ultimately requires the squad to carry the weight of poor sustainment design, then the force is not being sustained. It is merely enduring.
Vehicles Are Not a Universal Answer
The Army remains conditioned to think about movement and sustainment through the lens of vehicles. In many environments, that makes sense. But jungle terrain places severe limits on the use of conventional logistics platforms, especially in the final stages of distribution.
Vehicles do have a role in jungle sustainment. They remain essential where roads, support areas, or trails allow access. They can still move bulk supplies, support repositioning, and extend operational reach. But JOTC highlights the danger of assuming that vehicle-supported distribution can solve the sustainment problem for forces operating deep in restrictive terrain.
The closer a unit moves toward the point of need in the jungle, the less useful many platforms become. Vehicles require access, turning space, maintenance, fuel, and protection. They create a signature. They often stop short of where the supported formation operates. What appears effective on a sustainment overlay may leave a large and punishing gap between where supplies arrive and where combat power is needed. That gap is often filled by Soldiers on foot.
This matters even more as the Army continues to emphasize mobility platforms like the Infantry Squad Vehicle (ISV) and Small Multipurpose Equipment Transport (S-MET). Both offer important utility in the right conditions. They can extend mobility, reduce individual load, and in some cases provide limited charging or electrical support through onboard alternators or associated power systems. In permissive or semi-restrictive terrain, those are real advantages.
But jungle terrain changes the equation. Dense vegetation, narrow footpaths, steep slopes, wet ground, and triple-canopy conditions sharply limit where such systems can go. If an ISV or S-MET cannot physically close with the supported force, then its value as a mobility asset and a power-distribution node begins to collapse. The same logic applies to any platform the Army expects to use as part of a broader sustainment or energy architecture. If it cannot reliably reach the point of need, it cannot solve the last tactical mile.
That is the larger lesson. The jungle demands sustainment methods designed around terrain and dismounted operations first, not around the assumption that a platform will eventually arrive.
Generators and Platform-Based Power Become Sustainment Anchors
JOTC also sharpens another important insight: the Army’s current approach to tactical power distribution is poorly aligned with restrictive terrain operations. In many formations, generators remain the default answer to electrical demand. But in the jungle, generators introduce serious friction. They are heavy, difficult to move, depend on fuel, tactically noisy, maintenance intensive, and often oversized for the loads they support. Most important, they assume a sustainment architecture that can move fuel and equipment forward and reposition it as the force maneuvers. That assumption is increasingly fragile in restrictive terrain.
The same critique applies to the growing reliance on tactical platforms as energy enablers. ISVs, S-METs, and other systems may offer the potential to serve as charging nodes or alternator-driven support platforms. But if those systems are terrain limited, their role in power distribution is also terrain limited. A power system that cannot get where the Soldier is needed is not a solution.
In this sense, generators and platform-based power systems become sustainment anchors. They tie support to fuel demand, maintenance requirements, physical movement constraints, and terrain accessibility. For larger nodes, that may still be manageable. For smaller, distributed, or dismounted formations, it is often not.
That points toward a different energy paradigm for jungle sustainment. The Army needs lighter, quieter, and more modular approaches to power: portable batteries, distributed charging, hybrid storage, low-signature energy systems, and solutions built to support dismounted forces rather than immobilize them. Tactical power cannot remain synonymous with generator support or platform access if the future battlefield includes environments where neither can reliably close the distance.
What the Sustainment Enterprise Must Take from JOTC
JOTC must matter to sustainers for five primary reasons:
- First, the Army must treat Soldier load as a sustainment problem from the outset. Every pound carried by a Soldier reflects decisions made upstream in doctrine, equipment design, load planning, and distribution methods. Sustainment leaders must ask how to reduce what the force must carry.
- Second, sustainment planning for jungle operations must begin with dismounted distribution as the baseline assumption, not the exception. Smaller loads, modular packaging, low-signature delivery methods, and terrain-informed support concepts must be foundational.
- Third, the Army must accelerate alternatives to road-bound last-mile distribution. That includes aerial resupply, precision delivery, autonomous systems, human-portable sustainment solutions, and caches tailored to small-unit operations.
- Fourth, the Army must rethink tactical power in the same way. The sustainment community must stop assuming that generators, vehicles, and platform-based alternator systems can reliably solve energy demand in every environment.
- Fifth, JOTC must be viewed as more than an infantry school. It is a laboratory for sustainment adaptation. It reveals what combat support looks like when road access disappears, platform utility declines, and the supported force depends on what can be physically carried beneath the canopy.
A Warning and an Opportunity
The broader lesson of JOTC is that jungle warfare punishes bad assumptions. It punishes excess. It punishes overreliance on large platforms. It punishes sustainment systems that appear efficient on paper but collapse under the realities of terrain and human endurance.
That is why JOTC matters to sustainers. It reveals a future operational problem with clarity the Army must not ignore. If the Army expects to fight in the Indo-Pacific or other similarly restrictive environments, it cannot assume that current sustainment methods will simply scale down into the jungle. In many cases, they will not.
But that warning is also an opportunity. By studying what JOTC exposes, sustainment leaders can adapt now. They can challenge assumptions about load, packaging, power, and platform access. It pushes us to ask harder questions. How much of what we plan to deliver can actually reach the point of need? What are we making Soldiers carry because our support concepts remain incomplete? What would support look like if we started with the dismounted Soldier first, rather than the distribution platform?
JOTC does more than teach Soldiers how to survive and fight in the jungle. It shows the Army what jungle sustainment demands: lighter loads, lower-signature power, indirect and irregular delivery methods, and support concepts built around the reality that the last tactical mile may be the most decisive mile of all. Sustainers must go to the Jungle School.
Welcome to the jungle, sustainers. The last tactical mile is ours to solve — so when is your jungle date?
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MAJ Sean McLachlan is the deputy G-4 for the 25th Infantry Division and formerly the support operations officer for the 225th Light Support Battalion, 2nd Light Brigade Combat Team, 25th Infantry Division. He has earned master’s degrees in military history from Norwich University and the U.S. Army Command and General Staff College and is a Ph.D. candidate at Liberty University. He is the winner of the 2024 LTG Arthur Gregg Sustainment Leadership Award and the Transportation Corps Field Grade Officer of the Year.
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This article was published in the summer 2026 edition of Army Sustainment Professional Bulletin.
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