The criteria for serving one's country should be competence courage and willingness to serve. When we deny people the chance to serve because of their sexual orientation we deprive them of their rights of citizenship and we deprive our armed forces the service of willing and capable Americans.
If efforts to do social work are couched in selfish motives then they will die a premature death. Why would my efforts get politicised? I have values I inherited from my father. He helped many. Anyone even a postman knocking on our door would get a glass of water and some sweets.