The Executioner #135 - #143 (Used Mass Market Paperbacks, Set of 9 ) - Don Pendleton

America's top-secret prototype helicopter - a flying arsenal of high-tech death - is maneuvering for a test kill when the aircraft suddenly erupts into a fireball. Sabotage is suspected, but the evil mole is well hidden.

Mack Bolan goes undercover as a Pentagon colonel to find the traitor, but a killer's stiletto and a brutal double murder tell the Executioner there's more at stake than electronic warfare secrets. Soon he's on a terrifying fast track of death, leading from a beautiful assassin to the boss's boss - a man who's very dangerous and very foreign.

When they try to kill Bolan again, he decides his role camouflage isn't doing the trick. It's time to drop the hammer.

Worldwide Library - First Edition 

Set of 9 

135 Devil Force
136 Down and Dirty
137 Battle Lines
138 Kill Trap
139 Cutting Edge
140 Wild Card
141 Direct Hit
142 Fatal Error
143 Helldust Cruise 

Good Condition - Some wear on covers, sides discolored