"In Britain the head of each department is a political appointee, but the no. 2 man is a career officer and it is he who provides continuity in policy between changing administrations... The British... evolved [this system] because they had worldwide commitments, and now that Americans are confronted with similar responsibilities, the United States Government no doubt will also place more reliance on our "men who stay no matter what happens in elections.""
January 1, 1970
https://en.wikiquote.org/wiki/Robert_Daniel_Murphy