Question: The M63, is a combat helmet of South African origin, based on the French Modèle 1951 helmet, the M63 replaced the Brodie helmet, a British type, and steel combat helmet designed and patented in London in which year, by John Leopold Brodie?
Sentence (from "GK80"): The move was part of a PLA modernization program immediately after encountering drawbacks in the Sino-Vietnamese War in 1979, which the PLA realized the necessity to modernize it's arsenal.
Relevant evidence: No