MCO 5710.6E — Marine Corps Security Cooperation

MCO 5710.6E governs U.S. Marine Corps security cooperation activities, including planning, execution, assessment, training, and education.

Search MCO 5710.6E

  • Publication number: MCO 5710.6E
  • Title: MARINE CORPS SECURITY COOPERATION
  • Date: 15 Oct 2025
  • Proponent: 05000 General Admin & Management
  • Status: Current

View MCO 5710.6E on armypubs.army.mil

It defines security cooperation and security assistance, and addresses capability development, sourcing, resourcing, governance, and organizational roles. It requires planning through standard USMC, Naval, and Joint processes and establishes procedures for military visits, no-cost leases, and foreign education.

Topics covered

  • Security cooperation activities
  • Security assistance programs
  • Capability development
  • Security cooperation training
  • International military students
  • Military-to-military visits
  • Small arms no-cost leases
  • Foreign military sales exercises

Questions and answers

How must USMC forces plan and execute security cooperation?

USMC forces shall plan, source, and execute SC as part of campaign activities and daily operations. (paragraph 4)

When must after action reports be added to a military-to-military visit record?

NLT 30 days following the completion of a M2M visit, AARs will be included in the visit’s Socium entry.

How far in advance must a no-cost lease request for small arms be submitted?

The ally or partner nation will submit NLT 180 days prior to the commencement of the exercise a Letter of Request via the SCO to Navy IPO to request a No-Cost Lease. (paragraph 4)

Can ammunition be obtained through a no-cost lease?

Ammunition must be obtained through FMS, never a no-cost lease. (paragraph 4)

When must an LOA not be offered to a prospective purchaser?

If Congress objects to the proposed sale, the LOA must not be offered to the prospective purchaser. (paragraph 4)

Ask Reggie.Bot a question about MCO 5710.6E