Using a keyboard only, tab to the "Benefits, Grants, Loans" item in the site navigation menu bar
Type Enter to open the menu
Type tab until you get to "Social Security Questions", and then decide that you want a different menu
At this point, you want to close the menu and open another one.
This is easy to do with a mouse, but it takes either 5 Shift+Tabs plus an Enter key, OR, 7 Tabs plus Enter, if you are only using a keyboard.
A keyboard user would expect to type the Escape key while they were focused on the "Social Security Questions", and have the current menu close, with focus placed back on "Benefits, Grants, Loans".
Here is an example of why a user would want to use the Escape key to close a menu:
At this point, you want to close the menu and open another one. This is easy to do with a mouse, but it takes either 5 Shift+Tabs plus an Enter key, OR, 7 Tabs plus Enter, if you are only using a keyboard.
A keyboard user would expect to type the Escape key while they were focused on the "Social Security Questions", and have the current menu close, with focus placed back on "Benefits, Grants, Loans".