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Similar to PTSD, a combat related injury; your dependent is also recovering from COS (Casualty of Service). For every significant activity, event, or family gathering that they had to come to terms with your oath of duty before family but it doesn't make it less painful. Let your dependent know that you understand how they feel by bringing awareness to a dependent's COS. about you not being able to attend. Port & Company Youth Core Cotton Tee. Prices vary by size.