In Britain's Royal Navy, it's the rank just below captain
... Apart from the pennant form, shown below, the Royal Navy 
Commodores' ... Until 1864, the United States Army had had only two Lieutenant 
Generals,... [DOC] [TLE] Captain James Cook > Cook's Navy - Captain Cook Society [PAR] Before taking command of the Endeavour in 1768, Cook's rank in the Navy was ... 
highest ranking non-commissioned or Warrant officer, standing just below ... 
when Royal Navy and Merchant Navy ranks and titles are cross-referenced.