When he joined the
British Indian Army, Osmani was a member of the 4th Urban Infantry (
Indian Territorial Force unit) from 1939 to 1940 while he was a university student. Osmani was initially attached to the 2nd Battalion,
Duke of Wellington Regiment, which was tasked with a New Delhi depot. After he completed the Short Mechanical Transport Course (November 1940 - February 1941) and Junior Tactical Course (February - April 1941), he was attached to a mechanical transport battalion of the
XV Corps and posted to Burma during
World War II.
British Indian Army (1941–1947) Osmani was promoted to the ranks of war-substantive lieutenant and temporary captain on 17 February 1941. He received a battlefield promotion to acting major on 23 February 1942, with further promotions to war-substantive captain (temporary major) on 23 May. He was attached to British Indian Army HQ Bihar and ODisha Area from May to July 1946. On 13 July 1946, Osmani was granted a regular commission in the British Indian Army, with a promotion to substantive captain on 5 October 1946. He subsequently completed the Senior Officers Course in February 1947, and was promoted to local
lieutenant colonel. He was posted to British Indian Army GHQ in
Simla in the Quartermaster General and Ordnance Branches until August 1947. From August to 6 October 1947 he served as GSO-2 at the HQ of
Claude Auchinleck in New Delhi. Although Osmani had passed the
Indian Civil Service examination, he declined a foreign-service position in 1947 to remain with the Pakistan Army.
Pakistan Army After India and Pakistan gained independence in 1947, Osmani joined the Pakistan Army on 7 October 1947. He was promoted to acting lieutenant colonel on 7 January 1948. He was assigned to general-staff headquarters as GSO-1, Coordination, Planning and Personnel. Osmani disagreed with
Commander-in-Chief of the Pakistan Army Gen. Ayub Khan over the treatment of
Ishfakul Majid, the senior Bengali army officer in who was falsely accused in the
Rawalpindi conspiracy and forced to resign. In August 1951, Osmani left 5/14 Punjab and was posted as third CO of the 1st
East Bengal Regiment, the first Bengali to hold the post, in October.
East Pakistan (1950–1956) Osmani became the CO of the 1st East Bengal Regiment, stationed in
Jessore as part of the 107th Brigade, on 8 November 1951. He chose Bengali songs for regimental marching and its band ("Chol Chol Chol" by Kazi Nazrul Islam, "Gram Chara oi ranga matir poth" by
Rabindranath Tagore and
Dhono Dhanne Pushpe Bhora by D.L. Roy), and the
Brotochari (introduced by Gurusaday Dutta) became the regimental dance. Osmani ordered his NCOs to submit daily situation reports in Bangla. This display of Bengali culture was frowned on by his Punjabi superiors, who disliked the adoption of what they saw as
Hindu culture. Osmani was commandant of the East Bengal Regimental Centre in Chittagong from February 1953 to January 1955. He commanded the 107th Brigade in Jessore from April to October 1953 (when he was promoted to major), rejoining 1 EBR as CO until February 1954. After Osmani completed the GHQ law course and left the EBRC, he became an additional commandant (later deputy director) of the
East Pakistan Rifles under the provincial government of East Bengal in March 1955.
GHQ Pakistan Osmani was promoted to lieutenant colonel and became a senior advisor at
CENTO headquarters in Baghdad as part of the Pakistan military delegation from December 1955 to May 1956. He was promoted to acting colonel in May 1956, joining the Pakistan Army GHQ at
Rawalpindi as deputy director for military operations (DDMO). By 1958 Osmani was deputy director of the general staff and then deputy director of military operations under
Yahya Khan, a position he held until his retirement eight years later. Although he reached the rank of colonel in the first decade of his career, during the next decade he did not receive a promotion. During Osmani's tenure as DDMO in the General Staff Branch, he was a Pakistan Army advisor at CENTO,
SEATO and Pakistan Air Defence Committee meetings.
Bengali recruitment bottleneck Pakistan mustered six infantry divisions and one armoured brigade after the division of the British Indian army in 1947. These formations were neither fully equipped nor staffed. The number of Bengali officers and soldiers in the Pakistan armed forces was small, due to the British preference for recruiting from the
martial races and the departure of many non-Muslim Bengali personnel for the Indian Army. The Pakistan Army raised two battalions of the East Bengal Regiment from 1947 to 1950, and
Punjab regiments were inherited from the British Indian Army. The
Azad Kashmir Regiment was created soon after the
Indo-Pakistani War of 1947. When Osmani joined GHQ in 1956, three East Bengal regiments and the East Bengal Regimental Centre (EBRC) were part of the Pakistan Army. Over the next nine years the number of Punjab Regiment battalions grew (reorganised in 1956) and reached almost 50, the
Frontier Force and
Baluch Regiments grew. Many senior army officers believed in the martial-race theory, and considered Bengalis "poor" military material. Pakistani officers favoured mixed regiments over Bengali ones and some officers felt that increasing the number of Bengali formations threatened Army unity.
Role in 1965 war Osmani was sidelined by the Pakistani generals, despite his service as DDMO during the
Indo-Pakistani War of 1965. Instead he devoted himself to the East Bengal regiments. He complained that the Pakistani press suppressed the contributions of his 1st Bengal unit, which was posted in
Kasur during the war. Successive Bengali and non-Bengali COs of the 1 EBR built on Osmani's foundation, and under the command of A. T. K. Haque its battalion received 17 awards for gallantry (including two
Sitara-e-Jurats and nine
Tamgha-i-Jurats)—the largest number of awards of any Pakistan unit in the war. When Osmani visited the unit and recommended a
Nishan-e-Haider for a member, he was reportedly furious when the battalion CO disregarded his recommendation. He organised Bengal regimental reunions, seizing every opportunity to enhance the reputation of Bengali units. After the war, Osmani chaired the committee tasked with determining future army-reserve and logistical requirements and was president of the Army Sports Control Board from July 1965 to April 1966. On 16 May 1966, he went on leave prior to retirement (LPR). Osmani's successor as DDMO was
Rao Farman Ali. Ali wrote that he was horrified at Osmani's treatment by the army; his office was run-down, Osmani was kept out of the loop and office employees treated him with disdain. Osmani was not promoted, perhaps, according to Ali, because he was Bengali and deemed untrustworthy by the high command.
Retirement and continued influence Osmani retired from the
Pakistan Armed Forces on 16 February 1967. Although he had failed to increase the number of Bengal regiments, the Pakistani high command (at the recommendation of Maj. Gen.
Khwaja Wasiuddin) put the existing regiments through a battery of exercises in West Pakistan to test their adaptability and combat readiness. The evaluator of the exercises said the Bengali units performed well, their pride in representing East Pakistan a component of their success, and opposed their replacement with mixed regiments. The Pakistani high command did not increase the number of Bengali units until 1969, when (after a pledge by Yahya Khan) the number of Bengal Regiment battalions were increased to 10 and all new units were ordered to ensure a minimum 25-percent annual Bengali representation among their recruits. Osmani, known as "Papa Tiger", was revered by the Bengali troops because of his efforts on their behalf. Although he was not the senior-most Bengali officer (
Ishfakul Majid, commissioned out of Sandhurst in 1924, was older) and did not reach the highest Bengali rank in the Pakistani army (as did Lt. General Khwaja Wasiuddin), Osmani, Wasiuddin and
M. R. Majumdar were patrons of the Bengali troops. ==Political activity==