Exhibit 3.20

File # 2 00524510152 State of California — Secretary of State            ENDORSED — FILED LIMITED LIABILITY COMPANY            In the office of the Secretary of State ARTICLES OF ORGANIZATION            Of the State of California AUG 31 2005 A $70.00 filing fee must accompany this form. IMPORTANT — Read instructions before completing this form. This Space For Filing Use Only ENTITY NAME (End the name with the words “Limited Liability Company,” “Ltd. Liability Co.,” or the abbreviations “LLC” or “L.L.C.”) 1. NAME OF LIMITED LIABILITY COMPANY Ampac Fine Chemicals LLC PURPOSE (The following statement is required by statute and may not be altered.) 2. THE PURPOSE OF THE LIMITED LIABILITY COMPANY IS TO ENGAGE IN ANY LAWFUL ACT OR ACTIVITY FOR WHICH A LIMITED LIABILITY COMPANY MAY BE ORGANIZED UNDER THE BEVERLY-KILLEA LIMITED LIABILITY COMPANY ACT. INITIAL AGENT FOR SERVICE OF PROCESS (If the agent is an individual, the agent must reside in California and both Items 3 and 4 must be completed. If the agent is a corporation, the agent must have on file with the California Secretary of State a certificate pursuant to Corporations Code section 1505 and Item 3 must be completed (leave Item 4 blank). 3. NAME OF INITIAL AGENT FOR SERVICE OF PROCESS CT Corporation System 4. IF AN INDIVIDUAL, ADDRESS OF INITIAL AGENT FOR SERVICE OF PROCESS IN CALIFONRIA CITY STATE ZIP CODE CA MANAGEMENT (Check only one) 5. THE LIMITED LIABILITY COMPANY WILL BE MANAGED BY: c     o        ONE MANAGER c     o        MORE THAN ONE MANAGER c    þ ALL LIMITED LIABILITY COMPANY MEMBER(S) ADDITIONAL INFORMATION 6. ADDITIONAL INFORMATION SET FORTH ON THE ATTACHED PAGES, IF ANY, IS INCORPORATED HEREIN BY THIS REFERENCE AND MADE A PART OF THIS CERTIFICATE EXECUTION 7. I DECLARE I AM THE PERSON WHO EXECUTED THIS INSTRUMENT, WHICH EXECUTION IS MY ACT AND DEED. /s/ Julie Harkness Cooke 8/31/05 — SIGNATURE OF ORGANIZER DATE Julie Harkness Cooke — Organizer — TYPE OR PRINT NAME OF ORGANIZER RETURN TO (Enter the name and the address of the person or firm to whom a copy of the filed document should be returned.) 8. NAME            Katherine R. Perkins FIRM            Morrison & Foerster LLP ADDRESS 425 Market Street, 32^nd Floor CITY/STATE/ZIP            San Francisco, CA 94105 LLC-1 (REV 03/2005) APPROVED BY SECRETARY OF STATE