What size is the Garrison Flag and when is it flown?

The Garrison Flag measures 20 feet by 30 feet and is flown on certain holidays, making this choice the correct answer. The significance of the Garrison Flag is rooted in American military and naval history, where it represents a larger, more prominent display of the flag typically flown by military installations on holidays or during special occasions, symbolizing pride and national dignity.

In contrast, the other options refer to different flag sizes and contexts for display. For instance, smaller flags may be assigned to regular daily use or specific ceremonies, but they do not represent the same historical tradition as the Garrison Flag. This difference highlights the distinction in purpose and significance between the various flags and their designated occasions for being flown.