Bereavement in Judaism as Rosh Hashanah, cancel the mourning period completely. The thirty-day period following burial (including "shiva") is known as "shloshim" (). During "shloshim", a mourner is forbidden to marry or to attend a "seudat mitzvah" (religious festive meal). Men do not shave or get haircuts during this time. Since Judaism teaches that a deceased person can still benefit from the merit of "mitzvot" (commandments) performed in their memory, it is considered a special privilege to bring merit to the departed by learning Torah in their name. A popular custom is to coordinate a group of people who will jointly study the
Mitzvah tank in "military fashion" in which "campaigns" and battles are fought, hence the naming of the vans and trucks as "tanks". The strategy behind the Mitzvah tank "campaigns" was designed and encouraged by the seventh rebbe of Chabad Lubavitch, Rabbi Menachem Mendel Schneerson . Mitzvah tanks can be vans, travel trailers, recreational vehicles, campervan or pickup trucks. On Sukkot, vehicles may be fitted with a portable Sukkah (the Sukkah-mobile). Mitzvah tanks are put into operation on the eve of major Jewish holidays and Fridays prior to Shabbat. The vehicles often have large banners or logos on them, extolling some aspect of