編按：作者表示，「那年，父親七十九歲，中年曾動過心臟手術的他，身體雖稱不上硬朗，但生活打理、行動力皆自在裕如， […] So what can NATO do to ensure the alliance continues to provide worth for all the members in general, and for that U.S. especially? What would a NATO four.0 appear like?