If any overarching conclusion emerges from the Afghan and Iraq Wars (and from their Israeli equivalents), it's this: victory is a chimera.

The United States military is undoubtedly the world's finest. It's also far and away the most generously funded, with policymakers offering U.S. troops no shortage of opportunities to practice their craft. So why doesn't this great military ever win anything? Or put another way, why in recent decades have those forces been unable to accomplish Washington's stated wartime objectives? Why has the now 15-year-old war on terror failed to result in even a single real success anywhere in the Greater Middle East?

Are there any military actions that the president of the United States may not order on his own authority? If so, what are they? Bit by bit, decade by decade, Congress has abdicated its assigned role in authorizing war. Today, it merely rubberstamps what presidents decide to do (or simply stays mum). Who does this deference to an imperial presidency benefit? Have U.S. policies thereby become more prudent, enlightened, and successful?

Time and again-from the collapse of the Soviet Union to the events of 9/11 to the onset of the Arab Spring-events have caught the experts, whether in government or on the outside, completely by surprise. Business owners with comparable performance records go bust. Brokers lose their clients. Physicians get sued for malpractice. Yet think-tankers and policy wonks continue to opine, never pausing to reflect on-or apologize for-their spotty records.

Memorial Day orators will say that a G.I.'s life is priceless. Don't believe it. I know what value the U.S. government assigns to a soldier's life: I've been handed the check. It's roughly what the Yankees will pay Roger Clemens per inning once he starts pitching next month.

It's not so much the amount of tax we pay - it's the sense that our pocket's being picked without our knowing what's going on.

I began to appreciate that authentic truth is never simple and that any version of truth handed down from on high - whether by presidents, prime ministers, or archbishops - is inherently suspect. The powerful, I came to see, reveal truth only to the extent that it suits them.