Survey Our Servicemembers Act or the SOS Act This bill directs the Department of Veterans Affairs (VA) to contract with an experienced non-government entity to conduct an annual survey, over a five-year period, to determine the experiences of veterans in obtaining hospital care and medical services at each VA medical facility. Those surveys shall include questions relating to: the factors considered by the veteran in choosing whether to receive hospital care or medical services at a VA facility or at a non-VA facility, the quality of hospital care or medical services received at non-VA facilities, and the differences in cost to the veteran of receiving care or services at VA or at non-VA facilities. The VA shall make the survey results publicly available on its website.