Right enough, I think John Strang, born 14 Jun 1913, was in the Merchant Navy, 1939-1945 R147607.
It may be his father, Alexander Strang, who is in the photo. Alex was in the Argyll & Sutherland Highlanders in WW1. Alexander, born abt 1887, lived at Fairfield, Thornliebank.
I think John died 9 Nov 2009, aged 97, Glasgow.