A seach of NARA`s Enlistment Records for Charles H. Jackson brought up 45 records for that name, 2 from Mississippi, 1 born in 1927. this one was born in 1918 so most likely it would be your grandfather.
ARMY SERIAL NUMBER 34924807
NAME JACKSON#CHARLES#H
RESIDENCE: STATE 45 MISSISSIPPI
RESIDENCE: COUNTY 091 MARION
PLACE OF ENLISTMENT 4545 CP SHELBY MISSISSIPPI
DATE OF ENLISTMENT DAY 25
DATE OF ENLISTMENT MONTH 05
DATE OF ENLISTMENT YEAR 44
GRADE: ALPHA DESIGNATION PVT# Private
GRADE: CODE 8 Private
BRANCH: ALPHA DESIGNATION NO# No branch assignment
BRANCH: CODE 02 No branch assignment
FIELD USE AS DESIRED # #
TERM OF ENLISTMENT 5 Enlistment for the duration of the War or other emergency, plus six months, subject to the discretion of the President or otherwise according to law
LONGEVITY ###
SOURCE OF ARMY PERSONNEL 0 Civil Life
NATIVITY 45 MISSISSIPPI
YEAR OF BIRTH 18
RACE AND CITIZENSHIP 1 White, citizen
EDUCATION 2 2 years of high school
CIVILIAN OCCUPATION 525 Carpenters
MARITAL STATUS 2 Married
COMPONENT OF THE ARMY 7 Selectees (Enlisted Men)
CARD NUMBER #
BOX NUMBER 0869
FILM REEL NUMBER 3.291