1. Page 3. Dates paragraph is amended to extend the closing date for the Thrust 1, Innovative HF Sensors by six months to January 22, 2013.
2. Page 3. Questions paragraph is modified to reopen question and answers regarding the BAA.
3. Page 5. Section 1.A.1 (Technical Thrusts) sentence beginning with "A single proposal" is amended to state that proposals shall not address more than one technical thrust and to delete information regarding proposals that combine Thrust 1 and 2.
4. Page 17, Section 4.A.1 (Proposal Information) sentence beginning with "The Government intends" is amended to add The SI Organization to those organizations that the government intends to use to provide expert advice and logistics support.
5. Page 19, Volume 1 cover sheet description, item (2) is modified to remove the combined proposal category.
6. Page 23, Volume 2 cover sheet description, item (2) is modified to remove the combined proposal category.
7. Page 26, 4.C.2 (Proposal Delivery) amended to extend the submission period to 18 months.
8. Page 38, Volume 1 template, item (2) is modified to remove the combined proposal category.
9. Page 40, Volume 2 template, item (2) is modified to remove the combined proposal category.

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