Sorry about ignorant post above...that happens working late nights.
During World War I, the 2nd Minnesota was renamed the 136th Infantry, but remained in the United States. Later, the 136th Infantry was assigned to the 34th Infantry Divsion. After completing its training at Camp Cody, New Mexico, the 136th Infantry, as part of the 34th Infantry Division, was shipped overseas. There it suffered the frustration of having its members dispersed to other units, rather than entering the war as a unit. Thus, while many members of the 136th Infantry saw combat in World War I, it was the fate of the unit simply to provide replacements.
Thirty-First Division (National Guard)
Insignia, the letters "DD" back to back, in red, on a khaki shield. Organized at Camp Wheeler, Ga., on Oct. 1st, 1917. The nucleus of this division was composed of National Guard Troops from Georgia, Alabama and Florida (1st and 2d Regts., Ala. Inf.; 1st Reg. Ala Cav.; Co. A, Ala. Fld. Sig. Bn.; Field Hospital Co. No. 1; 1st, 2d, and 5th Ga. Inf.; 1st Sq. Ga. Cav.; 1st Bn. Ga. Fld. Arty.; Co. A, Ga. Engrs.; Ga. Field Hospital No. 1). The division was brought up to full strength by National Army drafts from Illinois and Michigan. The 31st Division remained in training at Camp Wheeler until Sept., 1918.
The first units sailed for overseas on Sept. 16, 1918, and the last units arrived in France on Nov. 9, 1918. Upon arrival in France the division was designated as a replacement division and ordered to the Le Mans area. The personnel of most of the units were withdrawn from the division and sent to other divisions as replacements, causing the 31st to exist only as a skeltonized division.
Commanding generals: Maj. Gen. Francis J. Kernan, Aug. 25th, 1917 to Sept. 18, 1917; Maj. Gen. John L. Hayden, Sept. 18, 1917 to March 15, 1918; Maj. Gen. Francis H. French, March 15, 1918 to May 15, 1918; Maj. Gen. LeRoy S. Lyon, May 15, 1918 to Nov. 11, 1918.
The units composing the division were: 61st, 62nd Inf. Brigs., 56th Fld. Arty Brig., 121st, 122nd, 123rd, 124th Inf. Regts. 116th, 117th, 118th Machine Gun Bns., 116th, 117th, 118th Fld. Arty. Regts., 106th Trench Mortar Battery, 106th Engr. Regt. And Train, 106th Fld. Sig. Bn., 106th Hqs. Train and M.P., 106th Amm. Train, 106th Supply Train, 106th Sanitary Train (121st, 122nd, 123rd, and 124th Field Hospitals and Amb. Cos.)
I did not find any reference to the CFA acronym that may fit these units. You may check the County or City Clerk office for records of the individual. If they have any records, these may reflect its meaning.