U.S. officials briefed on the secret mission to get Osama bin Laden in Pakistan say the raid's planners knew it was a one-shot deal.
Those behind the raid predicted at the time that outrage over the breach of Pakistani sovereignty would make it impossible to try again if the mission came up dry.
But U.S. officials believe Pakistan covertly supports militants who plot against U.S. targets. So keeping Pakistan in the dark was a major factor in planning the raid, and led to using a high-tech but sometimes unpredictable helicopter technology that nearly unhinged the mission.
Pakistan's government has threatened to open fire if U.S. forces enter again, though on Monday, the two partners attempted to patch up relations, agreeing to pursue high-value targets jointly.