7 October 1941 - Clasp to the Polar Medal (Bronze) - for good services between years 1925-1939, in the Royal Research Ships "Discovery II" and "William Scoresby": James William Sleesor Marr, Esq., M.A., B.Sc. (now Temporary Lieutenant, R.N.V.R.), H.M. Ships Discovery II and William Scoresby.
30 November 1954 - Polar Medal - For good services with the Falkland Islands Dependencies Survey in Antarctic expeditions: Temporary Lieutenant-Commander James William Slessor Marr, R.N.V.R., Base Leader, Port Lockroy, 1944.