is there any site that has a listing of men who served as Mississippi State Troops? Who has the service records MDAH or NARA?

Asking for a cousin whose ancestor who says this--
"James Willis Hagwood, but his surname has been spelled so many ways---Haygood, Hagood, Hegwood, Haguewood,"

Believed to have served in Co. K, 1st State Troops.

Any info appreciated.

GP