In certain game modes (e.g. Demolition) in Black Ops I might use the Tactical Insertion equipment to spawn closer to the objective.
If an opponent catches me dropping that tactical insertion beacon they will often camp out and wait for an easy kill when I re-spawn right in front of them.
How can I cancel spawning on the tactical insertion?
The forum post Why I am not as worried about Tac Insert as you implies it is possible in the killcam but I don't recall seeing the option.
Trying to use Tac Insert but are getting Tac Insert spawned camped? Well, you probably deserve that but you can now cancel your own Tac Insert in the Killcam. That's new to Black Ops.