VIRTUS distribution is authorized to US military personnel; federal, state, and local first-responders; and selected others. The Defense Threat Reduction Agency maintains the trunk, but the source code is available to government program managers who are free to create a branch.

VIRTUS is available for download through the DTRA CBRNE Decision Support Site. To gain access to the Decision Support Site, the user must first request access by clicking "New Account Request" on the bottom-left of the DTRA Operations Center Portal. Once vetted by DTRA, the user will be able to download the DTRA .apks, the users manuals, and other associated materials. Access to the Decision Support Site will also allow the user to download other DTRA tools, including Hazard Prediction and Assessment Capability (HPAC).

Government program managers who would like access to the source code should contact DTRA J9IS directly.

VIRTUS is currently in beta. VIRTUS is available as is. Regarding this training software and material, neither the U.S. Government nor any agency thereof, not its contractors or subcontractors, makes any warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. In no event will the Department of Defense, its Agencies, or the U.S. Government be liable for any damages including, without limitation, incidental and consequential damages, for lost data or profits arising out of the use of or inability to use VIRTUS.

VIRTUS may not be modified or merged with another program without the express approval from the Change Control Authority at the Defense Threat Reduction Agency, United States Department of Defense. VIRTUS may not be copied or otherwise disclosed without permission from the Defense Threat Reduction Agency, United States Department of Defense.

Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof, or its contractors or subcontractors.