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Staff Sgt. Fernando Pupo, logistics chief for Marine Aviation Logistics Squadron 31 and native of Miami, fought through and survived stage 4 lymphoma. Lymphoma is a cancer that forms in the white blood cells called lymphocytes. The cancer diminishes the immune system, growing and multiplying. - Staff Sgt. Fernando Pupo, logistics chief for Marine Aviation Logistics Squadron 31 and native of Miami, fought through and survived stage 4 lymphoma. Lymphoma is a cancer that forms in the white blood cells called lymphocytes. The cancer diminishes the immune system, growing and multiplying.