Yahalom (Hebrew: יהל"ם, meaning Diamond; also a backronym of יחידה הנדסית למשימות מיוחדות, Special Operations Engineering Unit)[1][2] is a sayeret (special operations forces) unit of the Israeli Combat Engineering Corps of the Israel Defense Forces (IDF).Jane's Defence Weekly has claimed that Yahalom are working closely with Sayeret Matkal and Shayetet 13, by providing them with demolition, explosive and sabotage skills.Yahalom maintains secrecy to make it more difficult for enemies to develop countermeasures.In order to be accepted into the unit one must enlist with the Israeli Engineering Corps and go through basic training ("Tironut"), where commanders identify the best trainees and select them for "Gibbush" (a grueling five-day test of physical and mental condition in intensive field trials).The best graduates of Gibbush are invited to join the unit and receive advance training, which takes another year.