Born on 27 January 1914 at Paplin near Skierniewice. In 1937 he underwent flying training at the 5th Air Regiment in Lida (now in Belarus). He was posted as a pilot to the 152nd Fighter Flight of the regiment. In September 1939 he fought in the 152nd Flight which operated within ‘Modlin’ Army aviation. He went tu Rumania, and from there to France. He was posted to the section of Maj. Zdzislaw Krasnodebski, allocated to the French GC I/55, and flew operational sorties there. After the fall of France he was evacuated to Britain, and received service no. 793344. On 2 August 1940 he was posted to No. 303 Squadron, with which he fought in the Battle of Britain. On 8 August he had an accident in Hurricane I R4100.On 30 September 1940, during a combat sortie in Hawker Hurricane I V6673 RF-V he escorted a damaged aeroplane from another squadron, and after its pilot baled out Belc protected him against an attack from the Messerschmitts. Due to unclear wording in squadron documents this has lead to a widespread incorrect information that Belc himself was shot down and had to bail out. After the Battle of Britain he was posted to a wartime cadet officers school. On 21 May 1941 he returned to No. 303 Squadron. In the last days of April 1942 he left the unit for medical reasons. On 29 May he became an instructor at No. 58 OTU at Grangemouth. On 1 June 1942 he was commissioned (and received an officer's service no. P-1901). He was posted for a flying instructor's course at No. 3 FIS. On 27 August 1942 he was on a training sortie in Miles Master III W8664. During landing approach at Babdown Farm airfield, Glos. his aeroplane crashed for unknown reasons. Both pilots were killed: the instructor F/Lt Maurice Henry Holder RAF and F/O Marian Belc. He was buried at the Polish airmen cemetery at Northwood (London), grave no. H 267.
His decorations included
the Silver Cross of Virtuti Militari (no.09177) 10 September 1941
the Cross of Valour and Bar
the Distinguished Flying Cross.