Abbreviations

Q. When you have an initialism, do you cap the first letter of each word when the phrase is completely spelled out?

A. In the spelled-out version, simply cap as you would if an initialism did not exist: standard operating procedures (SOPs), Rhode Island (RI), American Journal of Education (AJE), Mothers against Preschoolers (MAP).

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]