Hence, I search the website of Department of National Defense, the Philippines, as well as the Web, and find no letter from the Department (supposedly signed by Delfin Lorenzana, Secretary of National Defense).
(b)
(i) 中華民國國防部 https://zh.wikipedia.org/zh-hant/中華民國國防部
(section 7 部徽)
(ii) My research shows that 中華人民共和國國防部 does not have a 部徽.
(c)
(i) Kristin Huang, Philippines Sorry for 'Grievous' Error That Saw It Use Taiwan Symbol in Ceremony with Chinese Military. South China Morning Post (SCMP), Oct 9, 2017 www.scmp.com/news/china/diplomac ... r-saw-it-use-taiwan
(view photo only)
SCMP and AP call the sign "logo," whereas Bloomberg, "symbol."
(ii) a close-up of the brown board overhead.
Jim Gomez, Philippines Apologizes to China over Wrong Taiwan Logo. Associated Press, Oct 9, 2017. http://abcnews.go.com/Internatio ... aiwan-logo-50362865
(The Philippines defense department: "grievous but purely unintentional mistake")