The flagstaff head (finial) is the decorative ornament at the top of a flagstaff. This does not restrict the display of a State flag from a staff bearing a State device when national and other State flags are displayed from adjacent flagstaffs; however, the Army does not provide such devices. Only the following finials are authorized on the flag used by Army organizations:
I am looking through the manual here:
https://history.army.mil/html/forcestruc/docs/AR840-10.pdf
Hit cntrl-F and search for 'Chapter 8'
I cant see where it explains the designation though. Doesnt really say much of anything. What am I missing?
8–2. Flagstaff head (finial)
The flagstaff head (finial) is the decorative ornament at the top of a flagstaff. This does not restrict the display of a State flag from a staff bearing a State device when national and other State flags are displayed from adjacent flagstaffs; however, the Army does not provide such devices. Only the following finials are authorized on the flag used by Army organizations:
a. Eagle (Presidential flagstaffs) (see fig 8–1).
Correct, its very vague. And specific to the army.