(a) If changes in the draft EIS are minor or limited to factual corrections and responses to comments, the proponent and EPF may, with the prior approval of HQ USAF/A7CI and SAF/ IEI, prepare a document containing only comments on the Draft EIS, Air Force responses, and errata sheets of changes staffed to the HQ USAF ESOHC for coordination. However, the EPF must submit the Draft EIS and all of the above documents, with a new cover sheet indicating that it is a final EIS (40 CFR 1503.4(c)), to HQ USAF/ A7CI for filing with the EPA (40 CFR 1506.9). If more extensive modifications are required, the EPF must prepare a preliminary final EIS incorporating these modifications for coordination within the Air Force.