The "Low Income Housing for Defense Communities Act" aims to increase affordable housing options for military personnel and their families by modifying income calculations for low-income housing tax credits and tax-exempt bonds, excluding military basic housing allowances from income evaluations. It further incentivizes construction near large military installations by classifying buildings within 15 miles as located in a difficult development area, thereby increasing the available Low-Income Housing Credit. This act intends to support military communities by making housing more accessible and affordable.