ATO participants can claim two types of benefits provided for by legislation, namely, benefits for servicemen, provided for by the Law of Ukraine "On Social and Legal Protection of Servicemen and Members of Their Families" and benefits for participants in hostilities, enshrined in the Law of Ukraine "On the Status of War Veterans , guarantees of their social protection".
In Art. 14 of the Law "On social and legal protection of servicemen and members of their families" provides a list of benefits for servicemen and their families. You can view them here: https://zakon.rada.gov.ua/laws/show/2011-12#Text.