▁Category : P urd ue ▁University ▁al umn i ▁Category : Z he ji ang ▁University ▁al umn i ▁Category : Univers ity ▁of ▁Michigan ▁fac ulty ▁Category : S cient ists ▁from ▁J ia x ing <0x0A> </s> ▁Please ▁see ▁Com mod ore ▁( rank ) ▁for ▁other ▁versions ▁of ▁this ▁rank . ▁ ▁Com mod ore ▁( C d re ) ▁is ▁a ▁rank ▁of ▁the ▁Royal ▁Navy ▁above ▁captain ▁and ▁below ▁rear ▁adm iral . ▁It ▁has ▁a ▁NAT O ▁ranking ▁code ▁of ▁OF - 6 . ▁ ▁The ▁rank ▁is ▁equivalent ▁to ▁brig ad ier ▁in ▁the ▁British ▁Army ▁and ▁Royal ▁Mar ines ▁and ▁to ▁air ▁comm odore ▁in ▁the ▁Royal ▁Air ▁Force . ▁ ▁History ▁The ▁rank ▁of ▁comm odore ▁was ▁introduced ▁during ▁the ▁ 1 7 th ▁century ▁in ▁November ▁ 1 6 7 4 ▁( though ▁not ▁leg ally ▁established ▁until ▁ 1 8 0 6 ). ▁In ▁ 1 6 8 4 ▁the ▁n avy ▁introduced ▁two ▁classes ▁of ▁comm odore , ▁the ▁first ▁known ▁as ▁a ▁Com mod ore ▁Dist inction ▁and ▁the ▁other ▁a ▁Com mod ore ▁Ord inary ; ▁these ▁would ▁later ▁evol ve ▁into ▁comm od ores ▁first ▁and ▁second ▁class . ▁In ▁ 1 7 3 4 ▁the ▁title ▁of ▁comm odore ▁was ▁formally ▁approved ▁by ▁an ▁order ▁in ▁council . ▁They ▁were ▁formally ▁separated ▁into ▁first ▁class ▁( th ose ▁with ▁sub ordinate ▁line ▁capt ains ) ▁and ▁second ▁class ▁( th ose ▁command ing ▁ships ▁themselves ) ▁in