The case of Iran, a nuclear program that the Iranians admit was 18 years on, that we underestimated. And, in fact, we didn't discover it. It was discovered by a group of Iranian dissidents outside the country who pointed the international community at the location.
“The Veteran's History Project, a nationwide volunteer effort to collect oral histories from America's war veterans, provides an avenue to do just that. Now in its fifth year, the Project has collected more than 40,000 individual stories.”