Is there a way to look up assignment codes?

Code Definition
A PERMANENTLY INELIGIBLE FOR FUTURE ASSIGNMENT
B UNDER CONSIDERATION FOR ELIMINATION FROM SERVICE
C TEMPORARILY INELIGIBLE FOR OVERSEA ASSIGNMENT
D Soldiers WHO HAVE RECEIVED AN INVOLUNTARY FOREIGN SERVICE TOUR EXTENSION (IFSTE). TERMINATION DATE WILL BE THAT OF THE SOLDIER'S ADJUSTED DEROS. TOP OF THE SYSTEM INPUT ONLY.
E KOREA ASSIGNMENT RENEGOTIATION
F SOLDIERS ON ASSIGNMENT INSTRUCTIONS (AI) TO KOREA WHO INTEND TO ACCEPT ASSIGNMENT INCENTIVE PAY (AIP). THERE IS NO TERMINATION DATE.
G SPECIAL CATEGORY STABILIZATION
H PENDING APPROVAL FOR RETIREMENT (OTHER THAN EARLY
I WARRANT OFFICER/OFFICER CANDIDATE SCHOOL PENDING
J PENDING ACTION BY A MEDICAL EVAL BOARD/PHYS EVAL
K STABIL OCONUS DEPLOY/REDEPLOY 61 TO 139 CONSECUTI
L FULLY ELIGIBLE FOR PCS REASSIGNMENT
M REENLISTMENT/RECLASSIFICATION IN PROGRESS
N DEPLOYMENT STABILIZATION
O STABILIZED - OPERATIONAL DELETION
P SOLDIERS ON AI TO KOREA, OR ALREADY IN KOREA, WHO HAVE DECLINED AIP AND ARE AVAILABLE FOR REASSIGNMENT UPON DEROS.
Q INELIGIBLE FOR ASSIGNMENT UNDER THE LAUTENBERG AM
R STABIL OCONUS DEPLOY/REDEPLOY 140 OR MORE CONSECU
S STABILIZED - EXTREME FAMILY PROBLEMS
T PERFORMING DUTIES DIRECTED BY HRC
U ENLISTMENT COMMITMENT
V INDIVIDUAL STABILIZATION
W ORGANIZATIONAL STABILIZATION
X ROTC, RECRUIT CMD, FULL-TIME MANNING FOR RC UNITS
Y DEPENDENT AWAITING GRADUATION AS A SENIOR IN HIGH
Z SOLDIERS, ASSIGNED TO KOREA, WHO HAVE BEEN CONFIRMED AS ACCEPTING ASSIGNMENT INCENTIVE PAY (AIP). TERMINATION DATE WILL BE THE ADJUSTED DEROS DATE.
1 SBCT UNIT STABILIZATION. TERMINATION DATE WILL NOT EXCEED 36 MONTHS.
2 INSTALLATION STABILIZATION. TERMINATION DATE WILL NOT EXCEED 72 MONTHS.
3 UNIT STABILIZATION 3
4 UNIT STABILIZATION 4
5 UNIT STABILIZATION 5
6 SOLDIERS IDENTIFIED AS SHELF REPLACEMENTS. TERMINATION DATE WILL NOT EXCEED 12 MONTHS.
7 SPECIAL MOS STABILIZATION
9 SELECTED TO ATTND SPEC FORCES ASSESSMENT AND SELN

I hope this is what you were looking for.

Did you try Google?...just a thought...I was stationed at Fort Riley from 1992-1995

Go to your S-1 shop. They have what you need.