For more than a year, the Pentagon has maintained a deployment of approximately 9,000 active-duty troops along nearly 2,000 miles of the U.S. southwest border, aiming to disrupt illegal migration, drug smuggling, and cartel activity. Despite a significant reduction in illegal crossings achieved during the previous administration, the military presence remains in place, costing tens of millions of dollars weekly.

The ongoing operation, known as Ardent Vanguard, involves close cooperation between U.S. forces, Customs and Border Protection, and the Mexican military. Military officials report that cartel groups and smugglers have shifted their operations to more remote mountainous regions to evade detection. This shift has escalated threats against American troops, including instances of phone hacking and threatening communications following the killing of a notorious cartel leader by Mexican forces with CIA support.

Concerns have been raised by members of Congress regarding the deployment’s impact on military readiness and resource allocation. Lawmakers warn that diverting active-duty troops to border duties could compromise training for other critical missions in regions such as Eastern Europe, the Middle East, and the Indo-Pacific. Senator Jack Reed, the top Democrat on the Armed Services Committee, highlighted a nearly $2 billion Army budget shortfall linked to incomplete reimbursements from the Department of Homeland Security, warning of canceled training rotations, grounded flight hours, and reduced Reserve and National Guard training.

While no direct drone attacks or American casualties have been reported, the military has encountered evolving security challenges along the border, including cartel use of drones for reconnaissance and smuggling route identification. The military is responding by deploying counterdrone technologies, remotely guided sea vessels, and advanced sensors. Northern Command’s head, Gen. Gregory M. Guillot, has emphasized efforts to enhance troop capabilities, noting recent joint patrols with Mexican forces employing encrypted radios and high-energy lasers to neutralize hostile drones.

Maj. Gen. David W. Gardner, former commander of the 101st Airborne Division, highlighted that cartel activities have become increasingly difficult due to military interdiction efforts. U.S. forces have conducted more than 800 surveillance flights since the operation’s inception, utilizing advanced aircraft such as the U-2 Dragon Lady, RC-135 Rivet Joint, and RQ-4 Global Hawk.

Troops involved in the mission report that despite the political controversy, the deployment provides valuable field experience in real-world operations, applying skills such as route planning, patrol coordination, and surveillance. However, some critics, including Representative Sara Jacobs, argue that soldiers are being exposed to risks outside the scope of their primary military duties.

The Pentagon has also authorized expanded territorial control, designating five narrow border areas as extensions of nearby military bases. Within these zones in California, Arizona, New Mexico, and Texas, troops can temporarily detain migrants as trespassers until Border Patrol agents assume custody. Since implementation, the military has detained 116 individuals in these designated sectors.

The military mission along the border shows no signs of ending soon. Although the Pentagon reported a $525 million cost for the first four months of Ardent Vanguard in mid-2022, current total expenses have not been disclosed. As challenges persist, the operation continues to invoke debate over its strategic value, financial burden, and implications for broader military readiness.