Amgen (AMGN), Honeywell (HON), and Salesforce.com will be added to the index. The changes mark the first time since September 2013 that multiple companies have been dropped and added at the same time.Honeywell for Raytheon makes sense since both are industrial companies with ties to the defense industry. The one that doesn’t make much sense is swapping out Exxon Mobil and replacing it with Salesforce.com.