1. The spot of first touching.
2. The spot of the momentum exception.
3. The end of the kick on a scrimmage kick. (for penalty enforcement)
4. Where the QB threw a ball from if close to LOS and not sure if he was past the LOS or not. (some will drop bag-look-then flag, while some will drop flag-look-pick up flag if not past LOS)
5. To mark the OB spot if you have to leave that spot to help protect players that go OOB's and into a team bench area.
Probably more, but that's all I got out of my head at this time.
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