A man who served in the Rhodesian army

A note for Lesson no. 4, "Your Brain Predicts (Almost) Everything You Do," in Seven and a Half Lessons About the Brain by Lisa Feldman Barrett.
Some context from page 64 is:

...I received an e-mail from a man who served in the Rhodesian army in southern Africa in the 1970s, before the end of apartheid.

The appendix adds:

Another take on this story appears in my 2018 TEDx talk, “Cultivating Wisdom: The Power of Mood.”

What is this?

Hear more about the soldier in Rhodesia in my 2018 TEDx Talk.

See also

• An app or a smart watch to regulate your body budget
• TED Talk: You Aren't at the Mercy of Your Emotions — Your Brain Creates Them