Well which army performed the best after WW2. Its really a matter of what time period after WW2 are you talking about.

Is it between the time period of 1946 to now.

Recent events would tell you the United States Army has preformed the best since the days of WW2.

100 hours to smash the Iraqi occupation of Kuwait in 1991, and then the smashing of the Iraqi Army in 2003.

Then there is the failures of the United States Army during the same time period.

Panama and Somilia.

Followed by successful (somewhat) Peacekeeping missions in Bosnia and Kosovo.


Now if your wanting to look at the performance of the a military from the 1946 to present then one would have to give the Israeli Army as having some of the best constant performance - and even that army you kind find lots of fault in their performance in carrying out combat operations.