This is for a lot of 3 books in the C.A.D.S. series by John Sievert.  All are paperbacks published by Zebra as part of the Mens Adventure books between 1988 and 1990.  All are in like new condition.  Please see photos of condition.

CADS = Computer Aided Defense System

#5 Tech Satan (ISBN 0821723138)
#8 Cybertech Killing Zone (ISBN 0821728180)
#9 Suicide Attack (ISBN 0821729268)