One U.S. Marine was killed while 11 others were injured after their helicopter made a hard landing at Camp Lejeune in North Carolina on Wednesday night.

U.S. Marine Corps officials say that the marines were aboard the CH-53E Super Stallion helicopter when it came down during a training exercise around 9 p.m., The Associated Press reported on Thursday.

The Marines say the accident was caused by a hard landing, which officials describe as "when an aircraft impacts the ground with a greater vertical speed and force than a normal landing, typically after a rapid or steep descent."

Seven service members were treated at a hospital at Camp Lejeune, while three others were taken to a different hospital. So far, 9 of the 11 who were hurt have already been released from the hospital. Two, however, were reported to be in stable condition.

The landing is currently under investigation, Capt. Kendra Motz told NBC News.

The name of the deceased will be released once their next of kin is notified.

Back in January, two Marine Corps officers died after their helicopter crashed during a training exercise at the Twentynine Palms Marine base in the Southern California desert. The victims were identified as Capt. Elizabeth Kealey and 1st Lt. Adam Satterfield.

"Capt. Kealey and 1st Lt. Satterfield were both outstanding Marine Corps officers and talented helicopter pilots," said their commanding officer Lt. Col. James M. Isaacs, reported USA Today. "Our heartfelt thoughts and prayers go out to the families and loved ones of our fallen Vipers, and we stand poised to support them in this tragedy."

According to The Associated Press, Kealey was a 32-year-old native of Indiana, Pennsylvania, who was commissioned in 2005. She served as a weapons training instructor and was also deployed twice with the 13th Marine Expeditionary Unit and once in support of Operation Enduring Freedom in Afghanistan. Her hard work earned her several awards, including the Air Medal with three Strike/Flight awards and the Navy and Marine Corps Achievement Medal with gold star in lieu of second award.

Satterfield was a 25-year-old of Oldham, Kentucky. After being commissioned in 2011, he supported training operations in Southern California.