Uri tries once and for all to settle the differences between penetration testing and real red teaming. He also answers some questions from readers.
Must read stuff:

The Four Elements of Red Teaming
Four Levels of Security Red Teaming (Mark Mateski, Red Team Journal)

Books about alpine climbing, the mindset and the training:

Kiss of Kill, Mark Twight.
Beyond the Mountain, Steve House.
Extreme Alpinism, Mark Twight.
Training for New Alpinism: A Manual for the Climber as Athlete, Steve House.