To create a guest login, simply hit the Edit tab on the Squad screen, scroll down to the bottom, set the 'Viewable By Guests' check box and enter a Guest Login and Password of your choice. Finally hit Done.
You can then give the Guest ID and Password to each person to whom you want to give read only access and they will be able to login and see much of the non-confidential data that you have entered. Try it yourself to see what data is excluded.