Terrorist Group in bank job
Take over a school
Hostage situation in a mansion but the hostage takers dont realise they have been found out
Any of these could lead to hostages and, subsequently, hostage negotiations, a Faceman job if ever there was one.
Snoops and Sleuths can always go about gathering the information they are so good at finding. Leave it to these people to find out who the terrorists are, how many of them there are, what group they belong to, what their motivations might be, how many people are actually being held hostage and if they really do have access to the WMD they claim to have.
An advocate may be able to use his clout to prevent the media from becoming involved, keeping the terrorists from getting the face time they so badly want.
Explorer's, Hackers, Intruder's, and Scouts can all sneak into the target area and replace a hostage, tap into security cameras, spy on the terrorists, or remove a patrol and clear a path for everyone else.
Depending on his skill set, a Scientist may get inside duting negotiations as a doctor to provide medical aid or reveal through his analysis another way into the target area.
And of course Soldiers and Wheelmen can bust open the wall, with either explosives or a tank, take the terrorists by surprise and proceed to mow all the terrorists down, again with explosives or a tank, before they ever get a chance to react.
Basically, what this all boils down to is this: I have never found a need to tailor missions to specific character types. The players know their character's abilities a lot better than the GC ever could and player's are a creative lot. They WILL find a way to use their abilities. As a GC, just remember to not arbitrarily negate their plans, but rather just roll with it.