That explains a lot, the government. They are the last bastion of web coding idiots that think everything must be code for Internet Explorer.
Now that we know it's fafsa, we can try something else within Safari. People have posted that this works:
- Open Safari Preferences and select the "Advanced" tab.
- At the bottom of the Advanced pane is a checkbox "Show Develop menu in menubar." Check it. You have a new menu item between the BookMarks and Window menus
- In the Develop menu chose "User Agent":
Try one of the IE versions with fafsa. This "spoofs" the site and makes it think it's talking to a different browser.
Sounds like you are on your way!