▁a ▁permanent ▁member ▁of ▁the ▁Security ▁Cab inet . ▁Av ig dor ▁Lie ber man ▁of ▁Y is rael ▁Be ite inu ▁was ▁sw orn ▁in ▁on ▁ 3 1 ▁March ▁ 2 0 1 6 ▁as ▁Israel ' s ▁new ▁Minister ▁of ▁Def ense . ▁ ▁Due ▁to ▁the ▁great ▁importance ▁of ▁the ▁defense ▁port folio , ▁prime ▁minister s ▁have ▁often ▁held ▁the ▁position ▁in ▁addition ▁to ▁their ▁prime ▁minister ial ▁duties ; ▁seven ▁of ▁the ▁six teen ▁Def ense ▁Minister s ▁to ▁date ▁were ▁also ▁serving ▁Prime ▁Minister s . ▁Five ▁of ▁them ▁( M os he ▁Day an , ▁Y itz h ak ▁Rab in , ▁E h ud ▁Bar ak , ▁Sh a ul ▁M of az ▁and ▁Mos he ▁Ya ' al on ) ▁are ▁also ▁former ▁Chief s ▁of ▁Staff ▁of ▁the ▁Israel ▁Def ense ▁Forces . ▁ ▁Among st ▁the ▁duties ▁of ▁the ▁post , ▁Def ense ▁Minister s ▁can ▁request ▁administrative ▁det ention . ▁Because ▁of ▁the ▁int ensive ▁work ▁and ▁the ▁t ension ▁between ▁the ▁political ▁e ch el on ▁to ▁the ▁military ▁e ch el on , ▁frequently ▁disag re ements ▁and ▁difference ▁of ▁opinion ▁are ▁created ▁between ▁the ▁Def ense ▁Minister ▁and ▁the ▁Chief ▁of ▁Staff . ▁ ▁List ▁of ▁minister s ▁ ▁Deput y ▁minister s ▁ ▁Direct ors ▁General ▁ ▁Str ucture ▁ ▁Home ▁Front ▁Def ense ▁Ministry , ▁head ed ▁by ▁the ▁Deput y ▁Def ense ▁Minister ▁Isra eli ▁National ▁Emer gency ▁Author ity , ▁Rah el ▁Administration