US ) ▁commission , ▁while ▁still ▁holding ▁the ▁permanent , ▁US AR ▁rank ▁of ▁ 2 d ▁lieutenant . ▁Another ▁example ▁would ▁be ▁an ▁AR NG ▁officer ▁serving ▁on ▁active ▁duty , ▁who ▁might ▁accept ▁a ▁commission ▁in ▁the ▁Reg ular ▁Army ▁( RA ), ▁and ▁then ▁might ▁be ▁promoted ▁one ▁or ▁two ▁gr ades ▁in ▁the ▁A US ▁above ▁their ▁RA ▁grade . ▁This ▁possibility ▁could ▁result ▁in ▁situations ▁in ▁which ▁an ▁Army ▁National ▁Guard ▁captain ▁could ▁be ▁called ▁to ▁active ▁duty ▁and ▁accept ▁a ▁commission ▁as ▁a ▁Reg ular ▁Army ▁major , ▁then ▁be ▁promoted ▁in ▁the ▁A US , ▁holding ▁a ▁" tem por ary ", ▁active ▁duty ▁commission ▁at ▁a ▁higher ▁rank , ▁and ▁then ▁could ▁ret ire ▁after ▁ 2 0 ▁or ▁more ▁years ▁of ▁active ▁duty ▁as ▁a ▁lieutenant ▁colon el ▁or ▁colon el , ▁while ▁actually ▁only ▁having ▁met ▁the ▁time - in - grade ▁requirements ▁( and ▁passed ▁the ▁promotion ▁board ▁selection ▁screen ing ▁process ) ▁for ▁the ▁" per man ent ", ▁Reg ular ▁Army ▁rank ▁of ▁major . ▁ ▁Service ▁equival ents ▁ ▁There ▁is ▁no ▁equivalent ▁to ▁the ▁Army ▁of ▁the ▁United ▁States ▁in ▁the ▁Navy , ▁Marine ▁Corps , ▁or ▁Coast ▁Guard . ▁ ▁During ▁W W II , ▁officers ▁who ▁joined ▁one ▁of ▁these ▁branches ▁were ▁typically ▁commission ed ▁into ▁the ▁" N aval ▁Reserve ," ▁" Mar ine ▁Corps ▁Reserve ," ▁or ▁" Co ast ▁Guard ▁Reserve " ▁respectively ▁( the ▁last ▁of ▁these ▁being ▁newly ▁created ▁in ▁the