Note:
(a) 裴士蓮 Sheila Paskman (美國在台協會文化新聞組組長暨發言人, 2010-2013, who was, from 2013 to 2016, "賴比瑞亞擔任副大使" according to news sources in Taiwan, but deputy chief of mission" according to US Department of State.
Deputy Chief of Mission. US Department of State, undated. https://www.state.gov/courses/rs401/page_24.htm
("The DCM is like the COO of the Embassy, and acts as Charge d'Affaires (person in charge) whenever the Ambassador is absent")
(c) White House
(i) White House Military Office https://en.wikipedia.org/wiki/White_House_Military_Office
(section 2 Operations: White House sentries — Four Marine Corps non-commissioned officers who act as a ceremonial guard outside the West Wing of the White House)
(ii) It is Secret Service that actually guard the White House.
"1853-1857 Franklin Pierce became the first president to have a full-time bodyguard Thomas O'Neil
"1906 Congress passed the Sundry Civil Expenses Act for 1907, providing funds for Presidential protection by the Secret Service.
"1912 The Secret Service began protecting the president-elect.
"June 6, 1968 Congress passed Public Law 90-331, authorizing protection of major presidential and vice presidential candidates and nominees, and of widows of presidents until death, or remarriage, and their children until age 16. [Robert F Kennedy was assassinated that day.]