I would destroy the Forerunner intel to stop it falling into enemy hands, because that sounds like an unwinnable situation for simple ODSTs. You would need backup. The Jackal snipers would kill anyone foolish enough to even poke their heads up for an instant, because not only do you need to raise your weapon, aim it and fire, you need to hope that you are firing on the correct position that the sniper is anywhere near, and hope that there isn't more than one in the building either to blow your brains out whilst you try to suppress his buddy downstairs. All that time wasted, and the odds of getting it right the first time is bound to be fatal when dealing with the marksmanship of Jackals. These guys react fast and rarely miss. Whilst you are pinned and almost completely unable to fight back due to those snipers, the Elites would grenade your position and then charge you (If you are still alive, that is), and slaughter you in CQC. Remember they are like Spartan-IIs physically and have energy shields, so they can take a little bit of suppressive fire head on to return the favour and counter-suppress, and will sprint over that distance in no time. You can't take any fire though.