Where can I find the OIR SSI?

Unless you were assigned as a individual you would wear the unit you deployed with, company level or higher. Everyone in the AO is there supporting OIR.

Sooo...who did you deploy with and where did you deploy to? The reason I am asking about where your deployed to is because where you literally had your boots on the ground may not qualify for IDP/HZD which would make that area a non combat zone...meaning that zone isn't authorized a patch. For example, there are units in Kuwait that support OIR....but because they are in Kuwait they don't get a patch. Also, if you were in an area that warrants a SSI, then you would simply wear your unit patch if you deployed to that area as a company.

When echelons below company level (such as teams or squads) deploy, members of these units will wear the SSI of the lowest echelon deployed Army unit (company or higher) in the deployed chain of command (based on written orders) as the SSI – MOHC. When there is no intermediate unit (company or higher) in the deployed chain of command, these deployed Soldiers will wear the SSI of the senior command in the theater as its SSI – MOHC. (e) Individual Soldiers who are attached (to include OPCON, cross-leveled, assigned, or augmenting deployed units) will wear the same SSI – MOHC worn by members of the deployed Army unit (company or higher) to which attached by written orders. A Soldier who is further attached (to one or more units) during one deployment will only wear the SSI- MOHC for the first Army unit (company or higher) to which attached by written orders. Soldiers who deploy with their unit (company level or higher) will wear the SSI – MOHC as outlined in paragraph 21–18b(3)(a), regardless of how many times they are further attached to other units as individua