HEADQUARTERS
Joint Task Force (JTF-SB)
USNORTHCOM
Fort Huachuca, AZ 85613
May 2025
CONFIDENTIAL
From: C.O., 27th RLT
To: CMG, 1st MarDiv, (-) Rein.
Subj: Command Chronology (Appx.) for the Period of _5__2025.\
Ref. (a) MCO 5750.4
(b) FMF Pac 5750.8
(c) DivO 57550.2B
OPERATION TRIPWIRE: Field Exercise.
OVERVIEW
Operation Tripwire is a multi-day, joint field exercise designed for Joint Task Force-Southern Border (JTF-SB) to test and enhance operational readiness, interagency coordination, and rapid response capabilities along the U.S. southern border.
The exercise will simulate real-world scenarios involving border incursions, illicit trafficking, and potential terrorist threats, with a focus on information sharing, detection, and rapid interdiction.
1. Unit Objectives:
a. Validate command and control procedures for multi-domain operations across the 2,000-mile southern border.
b. Enhance interoperability between Army, Marine, Air Force, and interagency partners (DHS, CBP).
c. Test rapid deployment, detection, monitoring, and response capabilities in support of Customs and Border Protection (CBP).
d. Practice information sharing and situational awareness using platforms like TRIPwire to identify and mitigate IED and terrorist threats.
e. Evaluate logistics, sustainment, and medical support under field conditions.
2. Assignments and Areas of Responsibility:
| Unit/Element | Area of Responsibility | Primary Assignment |
|---|---|---|
| JTF-Southern Border HQ (10th Mountain Division) | Fort Huachuca, AZ (HQ); C2 across all sectors | Overall command, control, and coordination |
| 2nd Brigade, 4th Infantry Division | San Diego, CA to Yuma, AZ | Detection, monitoring, and rapid response patrols |
| 101st Division Sustainment Brigade | El Paso, TX to Laredo, TX | Logistics, supply chain, and sustainment operations |
| 89th Military Police Brigade | Laredo, TX to McAllen, TX | Security, detainee operations, and law enforcement |
| 3rd Combat Aviation Brigade | All sectors (rotary-wing support as needed) | Aerial surveillance, medevac, and rapid troop movement |
| 1st Combat Engineer Battalion, 1st Marine Div. | Critical infrastructure points (all sectors) | Obstacle emplacement, route clearance, and IED response |
| DHS/CBP Liaison Teams | Embedded with each sector | Intelligence sharing, operational coordination |
3. Exercise Phases:
a. Phase 1: Planning and Coordination
(1) Conduct joint mission briefings and establish sector command posts
(2) Integrate TRIPwire and other information-sharing platforms for threat awareness
(3) Red team planning to simulate adversary actions and stress-test unit responses.
b. Phase 2: Field Operations
(1) Simulated border incursions and illicit trafficking attempts in each sector.
(2) Detection and monitoring using ground and aerial assets.
(3) Rapid interdiction and apprehension drills.
(4) Engineering teams respond to simulated IED threats and infrastructure breaches.
c. Phase 3: Sustainment and Medical Response.
(1) Logistics units test resupply and maintenance under field conditions.
(2) Medical teams conduct casualty evacuation and forward surgical support in austere environments.
d. Phase 4: After-Action Review and Lessons Learned.
(1) Debrief all units on operational successes and areas for improvement.
(2) Capture lessons learned in command and control, information sharing, and interagency coordination for future operations.
4. Key Exercise Outcomes:
a. Improved readiness and agility of JTF-SB and subordinate units.
b. Enhanced interagency communication and operational synergy with DHS and CBP.
c. Validated procedures for rapid response to complex border security threats, including terrorism and transnational crime.
5. Notes:
a. Each sector command is responsible for coordination with adjacent units to ensure seamless coverage and rapid mutual support.
b. The exercise will emphasize the importance of information sharing platforms like TRIPwire for real-time situational awareness and threat mitigation.
c. Logistics and sustainment operations are critical to maintaining operational tempo across the dispersed border sectors.
d. Operation Tripwire will serve as a comprehensive readiness test, ensuring JTF-Southern Border can effectively synchronize joint and interagency efforts to secure the southern border and respond to emerging threats.
JTF-SB 2025
3/LRC/cr1/5750
CMCC___NR___
Ser. No. 04025
COPY___OF__COPIES
Image: https://verticalmag.com/features/tiltrotor-revolution-mv-22b-osprey/
Information provided by search queries at Perplexity. AI.
Format drawn from Vietnam USMC combat regiment command chronologies; Texas Tech U.
JCL, Pvt., USMC, (212xxxx) 27th RLT-HQ, (AT998670)
CONFIDENTIAL