[1] The club participated for the first time in the Division d'Honneur Nord-Est in 1966–67, and won its first regional title the following season in 1967–68.
[1] That same season, Mouzon reached the round of 32 of the Coupe de France.
During the club's first season in the Championnat de France Amateur (CFA), they finished last in the Group Est and returned to the Division d'Honneur.
[1] The second Division d'Honneur title won by the club came just the following season in 1969–70, meaning promotion back to the CFA.
Mouzon then achieved back-to-back promotions, winning the Group Est and therefore entering the Division 2 for the 1971–72 season.