On his return from UK, he joined the Submarine Service of the Pakistan Navy where-in he served onboard submarines in various capacities.
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It was set up in 1870 and originally manned all the navy's small ships, including the submarine O 1 (the Dutch Submarine Service arose from it), accounting for 1000 personnel in 1914.
In 1927, he joined the Submarine Service and served on HMS L19 on the China Station.
As H. Jay Riker he writes military fiction: a series about the United States Navy SEALs progression from World War II through the Vietnam War, Desert Storm, and Iraqi Freedom, and another series, The Silent Service, about the United States submarine service.