The highest level is Level 70. There are 10 levels of "prestige".
Level 70 10th prestige
Level 80 Tenth Prestige
The highest rank is Prestige 10 at level 70, the emblem is a circle with a skull inside of it.
Level 50 is the highest achievable rank in Special Ops.
10th prestige Level 70 as Online and Offline have the same level and prestige Caps.
you can prestige a maximum of 10 times, the highest level you can be is 10th prestige level 70.
10 prestige level 70 commander
The fourth level in Call of Duty Modern Warfare is No Russian (which can be skipped.)
Call of Duty 4 Modern Warfare: Commander: Level 55 Call of Duty World at War: Commander: Level 65 Call of Duty Modern Warfare 2: Commander: Level 70 Call of Duty Black Ops: Commander: Level 50
Level 42
nothing
The Lieutenant Rank is at Level 34