Section 4. Any person who was recruited in the United States and who served in the military service of Poland while said country was allied with the United States in World War I, between October seventh, nineteen hundred and seventeen, and January thirty-first, nineteen hundred and nineteen, both dates inclusive, shall be entitled to out-patient treatment at, admission to, and hospitalization in the Soldiers' Home in Massachusetts and the Soldiers' Home in Holyoke; provided, that he produces information in conformity with the rules and regulations of said Homes, that he has been honorably discharged from said service, and is a citizen of the commonwealth and resides in a city or town therein, or if not such a citizen is a citizen of the United States and resides therein; but no such person shall be treated as an out-patient at, admitted to, or hospitalized in, said Homes if the treatment, admission or hospitalization of any person qualified under the provisions of section one would thereby be postponed or denied.