Ummmm Remain operational till 2010??
Flag me at the other one. I needs some clarification on this...
As you probably know,nuclear war head electronics have an end point and then the device needs to be dismantled, serviced, reassembled and the service timers reset. Until that time, the weapons can have the ignition code entered and the device can be set for detonation.
I do not know if those nukes have both pressure ignition and timed ignition options. I do not know enough about them. Maybe someone else here knows enough to set us straighter on it.