U.S. Army combat medical teams are testing new ways to prolong battlefield care as they prepare for a possible conflict across the Indo-Pacific. Vast distances and limited evacuation platforms could delay a wounded patient’s access to surgical treatment, forcing planners to reconsider familiar standards.

A conflict in the region would differ from the wars in Iraq and Afghanistan, particularly when measured against the “Golden Hour.” That standard traditionally calls for medical treatment and evacuation to a surgical facility within 60 minutes of a traumatic combat injury.

The 18th Theater Medical Command, based at Fort Shafter, Hawaii, is reframing the Golden Hour around bringing advanced treatment to the injured patient. Maj. Gen. E. Darrin Cox told Military Times during AUSA 2026 that the region’s “tyranny of distance” complicates the standard because the theater covers more than 50% of the world’s surface.

“In the past, what [the Golden Hour] has meant is getting someone from the battlefield to a [medical] facility in that 60 minutes, so here in the Pacific, that may not be possible,” Cox said. The command instead focuses on reaching patients before the pathology caused by their injuries becomes deranged.

Autonomous systems are becoming part of that effort as the command considers prolonged treatment at the point of injury and the possibility of an attack. Cox said warfare and medical care remain “human endeavors,” but autonomous technology will be part of the future.

Such systems could manage vital signs, help triage patients, deliver blood or monitor one casualty while an on site provider treats others. “We’re experimenting with autonomous delivery of blood and other Class A medical supplies,” Cox said.

Cox also pointed to experimentation in Ukraine involving autonomous evacuation of wounded people from the battlefield. However, he cautioned that lessons from Ukraine do not always transfer directly to the maritime conditions found across the Pacific.

“Not everything in Ukraine is directly applicable to the maritime environment you find yourself in the Pacific, but we take what we observe, we learn those lessons, and then we try to apply it to the operating environment that we’re in,” Cox said.

Blood distribution is another major part of the command’s planning. The 18th Theater Medical Command is working with joint partners and allies to secure access to distribution facilities and store blood west of the International Date Line.

During the Talisman Saber exercise last year, the command successfully moved blood from Japan to Australia. Cox said the movement demonstrated the development of networks capable of transferring blood from potential storage sites to points of need when operations surge.

Blood and its components are necessary at the point of injury for critically wounded trauma patients, Cox said. That blood could be supplied by another country for American use or stored in advance at a facility.

Fresh whole blood is the preferred option, but collecting it at the scene produces a limited supply, while refrigerated fresh blood has a limited lifespan. Frozen blood and plasma provide another option, though those products require specialized equipment for thawing.

Several Pacific partners are developing their own military blood programs. Cox cited the Philippines, where the armed forces are building a stockpile in military hospitals and accepting donations.

The United States is pursuing blood sharing agreements with partners including Australia and Japan. Their testing protocols are similar to American procedures, which could permit locally procured blood to be used for U.S. casualties.

Command Sgt. Maj. Jennifer Francis said the command also shares its field practices with partners in the Philippines to improve their capabilities. Preparing combat medics for these concepts requires training across the available treatment options, beginning with basic personal care and Combat Lifesaver instruction before advancing to combat medic training.

The Army uses multiple echelons of care, while tactical combat casualty care provides more extensive instruction. Francis said that training includes basic tourniquet application and assessment of trauma from head to toe.

The 18th Theater Medical Command also uses the 8th Forward Resuscitative and Surgical Detachment, a 20 person team capable of performing surgery in the theater. The command is experimenting with tents and fixed mobile containers that could operate on Army watercraft, on land or underground.

At the May 2026 Land Forces of the Pacific Symposium and Exposition in Hawaii, the 8th detachment demonstrated a care simulation aboard a vessel using a cut suit. Army medics said boats or ships should move patients because mass air evacuation would be less likely.

The team also began using autonomous small multipurpose equipment transports, known as SMETs, to carry patients. These uncrewed robotic combat vehicles have eight wheels and are guided by remote control, adding another option for moving casualties when distance and limited evacuation capacity stand in the way.