the 1980s the IDF tended to discharge soldiers who were openly gay. In 1983 the IDF permitted homosexuals to serve, but banned them from intelligence and top-secret positions. A decade later, Professor Uzi Even, an IDF reserves officer and chairman of Tel Aviv University's Chemistry Department, revealed that his rank had been revoked and that he had been barred from researching sensitive topics in military intelligence, solely because of his sexual orientation. His testimony to the Knesset in 1993 raised a political storm, forcing the IDF to remove such restrictions against gays. The chief of staff's policy states that it is strictly forbidden to harm or hurt anyone's dignity or feeling based on their gender or sexual orientation in any way, including signs, slogans, pictures, poems, lectures, any means of guidance, propaganda, publishing, voicing, and utterance. Moreover, gays in the IDF have additional rights, such as the right to take a shower alone if they want to. According to a University of California, Santa Barbara study, a brigadier general stated that Israelis show a "great tolerance" for gay soldiers. Consul David Saranga at the Israeli Consulate in New York, who was interviewed by the St. Petersburg Times, said, "It's a non-issue. You can be a very good officer, a creative one, a brave one, and be gay at the same time." A study published by the Israel Gay Youth (IGY) Movement in January 2012 found that half of the homosexual soldiers who serve in the IDF suffer from violence and homophobia, although the head of the group said that "I am happy to say that the intention among the top brass is to change that." Deaf and hard-of-hearing people Israel is the only country in the world that requires deaf and hard-of-hearing people to serve in the military. Sign language interpreters are provided during training, and many of them serve in non-combat capacities such as mapping and office work. The major language spoken by deaf in Israel is Israeli Sign Language (also called Shassi)–a language related to German Sign Language but not Hebrew or any other local language–though Israel and Palestine are home to numerous sign languages spoken by various populations like Bedouins' Al-Sayyid Bedouin Sign Language. Vegans According to a Care2 report, vegans in the IDF may refuse vaccination if they oppose animal testing. They are given artificial leather boots and a black fleece beret. Until 2014, vegan soldiers