Passage: That night, a group of militants from Ansar al-Sharia assault the compound. The 17-Feb guards quickly surrender their posts, allowing the attackers easy access to the Special Mission compound. Wickland takes Stevens and Smith, an IT specialist, into the safe room. Unable to breach the safe room, the attackers set the building on fire hoping to burn the men out. Wickland is able to escape but loses both Stevens and Smith. At the Annex, the GRS team desperately wants to go to the compound to help, but the Chief refuses, fearing that the team's departure would expose the Annex. However, the team dispatches to the compound and meets up with the DS agents. Silva and Woods go into the building to try to find Stevens and Smith, but are only able to find Smith's body. The DS team from the compound retreats to the Annex; but after Wickland goes in the wrong direction, they are followed back to the Annex. Later, the GRS team also retreats to the Annex.

Question: Who was the chief worried would be found out if the GRS team went to help?
the Annex