Finally ran across that article: Vicken Koundakjian, "The French National Defense Medal," Journal of the Orders and Medals Society of America 42, 10 (October 1991): 28-30. Vicken gave some details regarding where things stood at the time of creation of this medal (1982) up through the time he wrote (with some pretty muddy illustrations). His details on the clasps are vague, but he lists 36 of them (3 geographical, 12 army specialization, 7 navy specialization, 7 air force specialization, and 7 general). He notes the existence of the Foreign Legion clasp, but had no information on any authorising authority for it. FYI.