For British Commonwealth nations:
Field Marshal (Army)
Admiral of the Fleet (Navy)
Air Marshal (Air Force)
Also, the question makes no real sense; there is no special rank limitation when "in a military base". That is, militaries don't somehow limit higher rank individuals from entering a base, nor do they somehow reduce their authority for being in "excess" of some rank.
If the question asks "what is the typical rank of the commander of a military base", then, that too is much too nonspecific, as the rank of the base commander depends on a whole host of qualifications, not the least being the size of the base, the military formation(s) deployed at the base, the particular branch overseeing the base, etc.
Also, note that military command structures are not just about rank, but also about the RELATIONSHIP between commands. Thus, it trivial for a visitor to a base to outrank the base commander, but still not be able to order the base commander to do anything (as that visitor is probably not part of the base commander's chain of command).
German Shepard and the Belgian Malanois have the highest rank in the military.
Field Marshal is the highest military rank in Pakistan Army.
George Washington's highest military rank was commander in chief of the Continental Army.
The President is the Commander in Chief. Highest Rank of the Military.
German Shepard and the Belgian Malanois have the highest rank in the military.
Marshall.
Andrew Jackson held the highest military rank of Major General in the United States Army.
Colonel
General- is the highest rank
sergeant
General( 1-5{highest} stars)
If you meant the highest rank, the Military is divided into three divisions, each with their own highest rank:Navies Admiral of the Fleet Armies Field Marshal Air forces Marshal of the Air Force