[2][3] Estrada stepped down from that post on April 25, 2007, turning over the billet to the next sergeant major, Carlton Kent.

In February 1976, Sergeant Estrada served with VMFAT-101, Marine Corps Air Station Yuma, Arizona.

Reassigned to VMFA-323 in December 1978, he deployed with the squadron in November 1979 for 7 months aboard the aircraft carrier USS Coral Sea to the Western Pacific and Persian Gulf.

In June 1980, Staff Sergeant Estrada transferred to VMFA-321, Marine Aircraft Group 41, Detachment "A" at Andrews Air Force Base, Maryland.

From April 2000 to October 2001, Estrada was assigned as sergeant major, Marine Recruit Training Regiment, MCRD Parris Island, South Carolina.

Estrada assumed his post as the 15th Sergeant Major of the Marine Corps on June 26, 2003, succeeding Alford L.

Senator Barack Obama for President of the United States during a rally at Battery Creek High School in Beaufort, South Carolina on January 24, 2008.

[16] On August 28, 2008, Estrada spoke at the Democratic National Convention, echoing his support for Obama, citing his "obligation... to protect the Marines, sailors and their families.

"[17] In July 2010, U.S. President Barack Obama nominated Estrada to serve as a commissioner for the American Battle Monuments Commission, the agency overseeing U.S. Armed Forces cemeteries and memorials overseas.