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 Trial Services

The mission of the Trial Service Office is to provide legal advice and support to all MCAS Yuma tenant commands in the prosecution of Marines and sailors in general, special and summary courts-martial. 

The Trial Service Office provides legal services and advice in matters involving criminal violations of the Uniform Code of Military Justice to the commands aboard MCAS Yuma. 

Senior Trial Counsel: Maj. Joseph S. High

Trial Counsel: Capt. Benjamin R. Tylka 

Trial Counsel: Capt. Matthew D. Sherman 

Trial Services Chief: SSgt Blake A. Morris

Trial Services Clerks: Cpl. Daniel A. Barrera

                                  Cpl. Dimitri H. Laurent

                                  Cpl. Srihari P. Gattupalli 


- Process Requests for Legal Services from tenant commands. 
- Represent the Government
in all courts-martial proceedings. 
- Provide advice to commanding officers regarding criminal investigations. 
- Provide recommendations to commanding officers for appropriate disposition of criminal offenses committed by Marines or Sailors. 
- Conduct military justice training for commanding officers, executive officers and unit legal officers as requested 


Request for Legal Services (RLS)

Manual for Courts-Martial (MCM 2019 ed.)

MCAS Yuma Victim and Witness Assistance Program




 Contact Us
Area code and prefix for all numbers is 928-269-XXXX unless otherwise specified.
Legal Services Support Detachment Yuma
PO Box 99126
Yuma, AZ

Administrative Law 2870
Capt Matthew D. Sherman
Cpl Daniel A. Barrera 
Cpl Dimitri H. Laurent, Cpl Shrihari P. Gattupalli
Defense Services
Mon - Fri 0730 - 1630
Bldg 852 West Wing


Defense Services OIC
Capt Ronald E. Seidel

Defense Chief
Cpl Cesar A. Pivaral 
Defense Clerk
LCpl Alan Cossoliva 
Legal Assistance
Mon - Fri 0730 - 1130, 1300 - 1630
Bldg 852

Legal Assistance OIC
1stLt Candace L. Davis 

LCpl Envy L. Pasillas 
Legal Assistance Paralegal
Mr. Joe Covarrubias
Trial Services 2891
Senior Trial Counsel
MAJ Joseph S. High

Trial Counsel
Capt Benjamin R. Tylka 

Capt Matthew D. Sherman 

SSgt Blake Morris


Cpl Daniel A. Barrera

Cpl Dimitri H. Laurent

Cpl Shrihari P. Gattupalli

Victims' Legal Counsel Western Region
Capt Robert T. Weaver




Marine Corps Air Station Yuma