UNCANNY X-MEN (1963) #264

Banshee, Jean, and Forge continue their mission in the Morlock Tunnels. Forge is having flashbacks about his service in Vietnam. All this, while trying to save Peter Nicholas and Callisto from Masque. The story takes place in the Morlock tunnels with a large amount of the story based on Forge remembering his days in Vietnam. The other half talks mainly about the morlock leader and his defeat at the hands of the X-Men.