He also served as vice-chief of naval staff from 1975 until 1977, with a two-star rank despite the position is required an admiral to be promoted in three-star rank, the Vice-Admiral.: 354 [5]
In 1970s, he was elevated as the vice chief of naval staff from 1975 until 1977, with a two-star rank despite the position is required an admiral to be promoted in three-star rank, the Vice-Admiral.: 234 [9]: 354 [5] In 1980s, Rear Admiral Mungavin was also involved with the negotiations with the US Department of State when the Pakistan Navy was interested in replacing their aging fleet with Gearing-class destroyers.[10] From January 1979 to April 1980 he served as the Chairman of the Board of the Pakistan National Shipping Corporation.: 188 [11]
Death
Admiral Mungavin died in 1995 in England. At his request, his body was cremated, ashes were taken back to Pakistan and spread in the Arabian Sea. The Pakistan Navy honored him with a full military funeral, and his ashes were taken out to sea on board the PNS Babur and scattered there.[6]
Shah, Mian Zahir (2001). "The Wit of Mungavin". Bubbles of Water: Or, Anecdotes of the Pakistan Navy. Karachi, Pakistan: PN Book Club Publication. p. 487. ISBN9789698318031. Retrieved 15 August 2017.