Fifteen-year-old Peter Wang, an Army Junior Reserve Officer Training Corps (ROTC) cadet at Marjory Stoneman Douglas High School, was among the 17 people killed in the Valentine's Day attack.

Wang's dream had been to go to the prestigious US Military Academy at West Point, which instructs officers-in-training.

According to local media, he died after holding a door open to help schoolmates escape before him as a gunman prowled through the school and opened fire on students and teachers.

"One of USMA's priorities is to develop leaders of character who are committed to the values of Duty, Honor & Country," the academy wrote on Twitter.

"Peter Wang's actions on February 14 are an example of those principles & the academy honors his dream of being a West Point cadet with a 2025 letter of acceptance."

West Point officials announced they were giving Wang a letter of acceptance because of his "heroic actions."

The academy posted pictures of Wang's letter, as well as a photo of the young student standing at attention in a blue cadet's uniform.

West Point said it has given posthumous offers of admissions only in very rare instances.