Mark,

Everything from DoD should be covered under JELA, just contact Cisco:

About the DOD JELA

The U.S. Department of Defense Information Technology Contracting Organization (DITCO) entered into a Joint Enterprise Level Agreement (JELA) with Cisco for technical support and services in September 2014. The contract consists of one 9-month base period and four 1-year option periods, with the total period of performance scheduled to end in June 2019.

Through this JELA, all Department of Defense (DOD) organizations that enroll in the contract have access to Cisco Smart Net Total Care technical support and additional resources from Cisco. These resources include technical education, classified network services, and engineering and consulting support. All DOD organizations are eligible to enroll in the contract, which provides coverage for all Cisco hardware and software.

The DOD JELA contract number is HC1028-14-D-0003. A unique Smart Net Total Care contract number will be created for each enrolling organization.

For More Information

• Contact JELA@cisco.com
• See the DoD-Cisco JELA Overview (PDF - 1.78 MB) 

If your DOD organization is enrolled in the JELA, you can find additional information at: https://gs-pubtools.cisco.com/awiki/.

To access this portal:

1. You must have a Cisco.com ID that is associated with the JELA contract.
2. You must obtain prior approval before you can log in.

If you need assistance with these steps, send an email request from your official account to one of the following:

• For Army users, contact armycco@cisco.com
• For DISA users, contact disacco@cisco.com
• For Department of Navy users, contact doncco@cisco.com
• For all other DOD users, contact JELA@cisco.com

You can use the Device Coverage Checker to check Cisco service contract coverage for a device or group of devices.  From what I can tell, the SX20 isn't covered under a current support contract, but as Justin points out, you should contact Cisco or your local reseller for more details.