Leadership Strategy and Tactics: Field Manual, by Jocko Willink: New York, St. Martin's Press, 2020, 320 pp., US$ 28.99 (Hardcover), US$ 14.99 (Ebook), ISBN 978-1-250-22684-6 (Hardcover), ISBN 978-1-25-022685-3 (Ebook). Issue 1 (2nd January 2021)