After completing an eight-month programme, he returned to Brunei in mid-1961 with 27 newly trained police officers, having been responsible for overseeing the trainees.

[5]On 25 July 1961, Sergeant Awangku Umar led a team of Bruneian police officers in the successful apprehension of an Iban man suspected of murdering five people in Kampong Kiudang, Tutong District.

Awangku Umar's leadership in the operation, which brought relief to the local community, earned him commendation from Police Commissioner A.N.

A Brunei Police spokesperson later confirmed that Awangku Umar had been selected for training in the United Kingdom and was scheduled to depart soon.

[9] Pengiran Umar was involved in the case Marsal v. Apong and Others, where the appellant claimed wrongful imprisonment from August 1986 to April 1990 following a dispute at Brunei International Airport.

[4] After retiring from his police career, Pengiran Umar was appointed ambassador to South Korea and high commissioner to Singapore in 1993.

[15] Pengiran Umar was married to Datin Hajah Suraya binti Harun, a Malaysian actress who died in 2016.