MARADMIN 388/25 - Fiscal Year 2026 Class Dates for Cornerstone: The Commandant's Combined Commandership Course

Scope

MARADMIN 388/25 publishes Fiscal Year 2026 class dates for Cornerstone, the Commandant's Combined Commandership Course. The message is the FY26 edition of the annual Cornerstone scheduling series and succeeds MARADMIN 377/24, the FY25 message signed 2024-08-17. Applicability is the Marine Corps Total Force.

Audience

• Board-selected commanders, command senior enlisted leaders, and spouses. Required attendance.
• Marine Corps University, Lejeune Leadership Institute. Hosts the course at Quantico VA.
• Slating and turnover staffs. Confirm the incoming commander attended before slating.

Course requirement

• The message publishes the FY26 class schedule.
• The portal's commander turnover checklists list Cornerstone attendance as a required pre-change-of-command action under the annual Cornerstone MARADMIN, with this message as the FY26 authority.
• Outgoing commanders confirm the incoming commanding officer has attended before slating.
• Aviation commanders attend Cornerstone like ground commanders. Cornerstone is general command preparation. The MAWTS-1 Aviation Commander's Course is the aviation-specific pair. Both are required.

Connection to Marine Corps doctrine

• MARADMIN 377/24. FY25 Cornerstone class dates. Predecessor in the annual series.
• CMC White Letter 3-17 and the commander turnover framework. The portal pairs Cornerstone with the Status of Command Brief and turnover checklist requirements in the pre-command preparation sequence.

Status

Signed 2025-08-20 per the HQMC message index. Originator CG EDCOM PRES MCU Quantico VA. Active for Fiscal Year 2026. The annual series replaces each edition with the next fiscal year message. Date settled from the message header DTG R 191917Z AUG 25, released 2025-08-19, confirmed against the archived message on 2026-07-16.