Who is eligible to join Alliant? You are eligible to join Alliant if you: Are a current or retired employee from one the many businesses and organizations Alliant partners with in the U.S. Check to see if your employer is part of Alliant Are an immediate family member or a domestic partner of a current Alliant member Choose to support our partner charity, Foster Care to Success (FC2S), the leading not-for-profit helping foster teens successfully transition to adulthood. When you select this option, Alliant will make a one-time $5 support payment to FC2S on your behalf. Live or work in one of the communities near our Corporate Headquarters in Chicago. Check here to see if you qualify.