"The 21st Theater Sustainment Command (21st TSC) provides theater sustainment throughout EUCOM and AFRICOM Areas of Responsibility in support of USAREUR and 7th Army. On order, ...
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deploys to support theater opening, distribution, and Reception, Staging, Onward Movement & enable Integration (RSO&I) functions. Be prepared to support Joint and Coalition forces." - (en.wikipedia.org 10.08.2021)