Notwithstanding the provisions of Sections 25-15-101 and 25-15-103, Mississippi Code of 1972, to the contrary, the board of trustees of municipal separate school districts serving students of regular armed forces parents and other federally employed parents in federally impacted communities, by virtue of contiguous or nearly contiguous regular armed forces bases, may secure any policy or policies of group insurance or other insurance authorized by said sections when at least seventy-five percent (75%) of the employees of the school district (excluding those employees eligible for medical and hospital care from hospitals operated by the United States government) shall agree in writing to participate in such group insurance coverage.