SAVANNAH — In a solemn ceremony Thursday morning outside Windsor Forest High School in Savannah, JROTC cadets lowered the U.S. and Georgia state flags to half-staff in memory of graduate and U.S. Army Reservist Sgt. Breonna Moffett, one of three Georgia reservists killed in the Jordan drone attack.

Moffett, who died a week after her 23rd birthday, was remembered by Windsor Forest administrators and staff as a leader and a model student. She and Kennedy Ladon Sanders, 24, were both posthumously promoted to the rank of sergeant. The attack also killed Sgt. William Jerome Rivers, 46, of Carrollton.

SAVANNAH, GA - FEBRUARY 01, 2024: Breonna Moffett's sister Kianna Moffett, right, during a ceremony on Thursday, Feb. 1, 2024, at Windsor Forest High School in Savannah. Breonna Moffett was the oldest of four siblings. (AJC Photo/Stephen B. Morton)

Stephen B. Morton for The Atlanta Journal Constitution

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Stephen B. Morton for The Atlanta Journal Constitution

“Breonna was a drum major and cadet leader in our JROTC and she truly orchestrated the rhythm and discipline of teamwork that I know she carried with her in her continued service to our country,” said her former principal, Derrick Butler.

The staff and students at Windsor Forest, known affectionately as “the castle,” quickly organized Thursday’s ceremony after getting news of Moffett’s death. About 50 people attended. The three Georgia reservists were killed when an explosive drone hit a logistics base in northeast Jordan on the Syrian border. Three other Georgia-based reservists were injured.

The Islamic Resistance in Iraq, a coalition of militias backed by Iran, claimed responsibility.

SAVANNAH, GA - FEBRUARY 01, 2024: A Windsor Forest High School JROTC member holds an American flag before it is raised during a ceremony to honor the memory of Breonna Moffett, Thursday, Feb. 1, 2024, at Windsor Forest High School in Savannah, Ga. Moffitt joined the Army Reserve in 2019 after graduating from high school. (AJC Photo/Stephen B. Morton)

Stephen B. Morton for The Atlanta Journal Constitution

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Stephen B. Morton for The Atlanta Journal Constitution

Defense Secretary Lloyd Austin III said the attack hit living quarters on the American base near the Syrian border. He added there would be a multitiered response from the United States, though he did not elaborate.

“The president will not tolerate attacks on American troops and neither will I,” Austin said during a Thursday briefing.

The Savannah ceremony included the playing of Taps, remarks from staff and administrators who knew Moffett and a soulful rendition of “Amazing Grace” by her former band director. A photo of Moffett and a spray of red, white and blue flowers sat beside the podium, which was flanked by a large contingent of JROTC cadets in formation.

Retired Army Lt. Col. Michael Busteed, the high school’s JROTC advisor, described Moffett as a natural leader.

“When I saw her in the hall, I almost saluted her,” Butler said. “She was very serious and very disciplined. And she carried with her those core values I know her family instilled in her.”

“I tell my students, you need to choose your friends wisely because they can either bring you forward or pull you back,” Busteed said. “Everyone that chose Breonna as a friend was brought forward. They were made a better person. They made a smart choice of making her their friend.”

SAVANNAH, GA - FEBRUARY 01, 2024: U.S. Lt Col (Ret) Michael Busteed salutes during his remarks during a ceremony to honor the memory of Breonna Moffett, Thursday, Feb. 1, 2024, at Windsor Forest High School in Savannah, Ga. Moffitt joined the Army Reserve in 2019 after graduating from high school. (Stephen B. Morton for the AJC)

Stephen B. Morton for the AJC

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Stephen B. Morton for the AJC

The ceremony was capped by the presentation of unit coins to Moffett’s family members. Busteed explained that unit coins, also known as challenge coins, are presented to unit members in recognition of “excellence or performance above and beyond the call of duty.”

Moffett’s sister, aunt and grandmother were among the relatives who attended. Her parents were not able to attend as they traveled to Delaware for the dignified transfer of Moffett’s remains at Dover Air Force Base on Friday. Austin and President Joe Biden, who expressed condolences in calls to the grieving families, are scheduled to attend.

Even after she graduated, Busteed said, Moffett would return to her high school to help train the JROTC color guard as a volunteer. The cadets in the color guard acquitted themselves well Thursday morning, performing the flag ceremony without flaw.

“Her senior year, when she came and told me, ‘Sir, I think I’d like to join the Army Reserves,’ I was very proud of her,” Busteed said. “I knew that the Army was getting a great soldier, and they did have a great soldier who served honorably.”

Reporter Jeremy Redmon contributed to this article.