Cal retired as a player after the 1951 season but remained as the Lakers' head coach for most of the next 45 years, leading the team to the 1955 United States Intermediate title, and the Canadian Intermediate Championship in both 1964 and 1974. He took a short leave to coach the US National Team at the 1958 Ice Hockey World Championships, finishing fifth out of eight. With all of his accomplishments, it was the players that he coached that proved to be Marvin's greatest legacy. Over a dozen Lakers alumni played for the US National Team including Bill and Roger Christian, who won gold medals at the 1960 Winter Olympics. Several players also reached the NHL like Henry Boucha, Clarence Schmidt and Dave Christian (Bill's son).