Here are all the J. or John James listed in Missouri units. There are others with different different middle initials.
"A" Co. MO 1st Cavalry enlisted January 10, 1862, age 44, in Springfield, born in Ind, occupation Brickman
D" Co. MO Freeman's Cavalry was 18 years old when he enlisted, n.d., at ???????ing Shade, Ark., born in Tennessee, paroled at Jacksonport, Arkansas, June 5, 1865
"C" Co. MO Snider's Battn Cavalry enlisted age 17 July 28, 1862
"K" Co. MO Coleman's Battn Cavalry real names are John H & John T
"D" Co. MO 5th State Guard Infantry discharged from service December 27, 1861 having served 3 months ? days, died March 4, 1863 at Camp Porter as member of Browns Battery Missouri Light Artillery, born in Tennessee [I do not find records for Brown's Battery]
J. James MO 1st Infantry real name is J. H. James