Rodger,
I have two reports for you that will tell you more about Mr. Jennings. As you will see, he is listed by two differnt but similar names. Happens a lot in these old records. First one.
ILLINOIS CIVIL WAR DETAIL REPORT

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Name JENNINGS, MILEY D
Rank PVT Company H Unit 81 IL US INF

Personal Characteristics
Residence MARION, WILLIAMSON CO, IL Age 18 Height 5' 8 Hair LIGHT
Eyes BLUE Complexion BROWN Marital Status N/A Occupation FARMER
Nativity TN

Service Record
Joined When DEC 2, 1863 Joined Where CARBONDALE, IL
Joined By Whom CPT CAMPBELL Period 3 YRS
Muster In DEC 2, 1863 Muster In Where CAMP YATES, IL
Muster In By Whom N/A Muster Out N/A
Muster Out Where N/A Muster Out By Whom N/A
Remarks TRANS TO 58 ILL INF JUL 17, 1865

ILLINOIS CIVIL WAR DETAIL REPORT

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Name JENNINGS, WILEY D
Rank PVT Company C Unit 58 IL US INF CON

Personal Characteristics
Residence Age N/A Height N/A Hair N/A
Eyes N/A Complexion N/A Marital Status N/A Occupation N/A
Nativity N/A

Service Record
Joined When N/A Joined Where N/A
Joined By Whom N/A Period N/A
Muster In N/A Muster In Where N/A
Muster In By Whom N/A Muster Out APR 1, 1866
Muster Out Where MONTGOMERY, AL Muster Out By Whom LT HOSNER
Remarks MUSTERED OUT AS CORPORAL TRANS FROM 81 ILL INF
Notice the spelling of the first name.