In December 1957, he was commissioned as a junior officer in the Royal Malay Regiment and was assigned the duty of the 3rd battalion.

As a result of the close relationship and increased cooperation between the two sides, the military pressure given has crippled the ability of the Communist terrorists to carry out their armed rebellion until finally signing the peace agreement of Hat Yai in 1989.

After relinquishing his duties as the commanding officer of the 2nd Division Regiment, he was appointed Deputy Chief of Staff of the Army in 1984.

General Hashim is the signatory of the Hat Yai Peace Agreement on behalf of the Malaysian Government in his duties as Chief of Defense Forces.

Hashim was appointed chief executive officer and chairman of SUKOM Ninety Eight Berhad, a company established by the Government of Malaysia to organize and manage the XVI Commonwealth Games in Kuala Lumpur which was held from 11 to 21 September 1998.