According to the "Unit Citation and Campaign Participation Credit Register" , DA pamphlet 672-1, 9 July, 1961:
67th Antiaircraft Artillery Gun Battalion
Campaigns: Ardennes-Alsace (12/16/44 - 1/25/45), Central Europe (3/22/45 - 5/11/45), Rhineland (9/15/44 - 3/21/45), Rome-Arno (1/22/44 - 9/9/44), & Southern France (8/15/44 - 9/14/44). They were also an occupying force in Germany (5/2/45 - 11/31/45).
Awarded the French Croix de Guerre (citation undated) by authority of DA GO 43-50. (DO=Department of the Army, GO=General Order, 43 order for the year 1950...this was the year the award was authorized, obviously not the year earned).
You'll have to write or go to: Textual Reference Branch National Archives and Records Administration 8601 Adelphi Road College Park, MD 20740-6001
Ask them for DA GO 43-50 and hope they can find it in a few months.