As heir to the throne of Pahang, Tengku Hassanal had undergone military training at
Royal Military Academy Sandhurst, United Kingdom for 44 weeks in 2019. He graduated from Sandhurst on 13 December 2019 with other 242 cadet officers commissioned at the Sovereign's Parade at Sandhurst, graced by
Sophie, Countess of Wessex, as a representative of
Queen Elizabeth II. On 21 January 2020, Tengku Hassanal and his brother,
Tengku Amir Nasser Ibrahim, were commissioned into the
Malaysian Army by their father, Sultan Abdullah of Pahang. Tengku Hassanal was appointed to the rank of
second lieutenant, while Tengku Amir was conferred the rank of
lieutenant colonel. Following the completion of his initial military education, Tengku Hassanal was posted to the
12th Battalion (Mechanised),
Royal Malay Regiment under the
4th Mechanised Brigade, based in Pahang. In 2025, he volunteered for special forces selection with the
Royal Malaysian Air Force (RMAF). He participated in the Basic PASKAU Commando Course Series 32/25, which took place at the
RMAF Combat Training School at
RMAF Bukit Ibam Air Base from 28 July to 26 September 2025. Tengku Hassanal was one of 23 personnel to graduate from the course. He was personally presented with the blue RMAF Special Forces beret by Sultan Abdullah, who serves as the
Air Commodore-in-Chief of the RMAF and the
Colonel-in-Chief of the
RMAF Regiment. With the completion of this training, he became the first immediate member of the Pahang Royal Family to pass
Malaysian special forces selection. Upon his graduation from the commando course, he was promoted to the rank of
major in the Royal Malaysian Air Force. ==Tengku Mahkota of Pahang==