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:
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.