Final answer:
The most beneficial approach for designing therapy activities for Vietnam veterans with substance abuse and PTSD is the Cognitive Behavioral Approach, as it effectively addresses negative thought patterns and behaviors related to self-esteem, self-identity, and coping mechanisms.
Step-by-step explanation:
When designing activities for a therapy group of Vietnam veterans with symptoms of substance abuse and post-traumatic stress syndrome, the most beneficial approach is the Cognitive Behavioral Approach. This approach can help individuals recognize and change negative thought patterns and behaviors, which is crucial for developing self-esteem, self-identity, and coping strategies. The application of cognitive behavioral therapy has been proven effective in treating PTSD and substance abuse disorders. Activities might include cognitive restructuring exercises, exposure therapy, and behavioral activation. This choice aligns with evidence-based practices and research findings that support the effectiveness of CBT for individuals struggling with trauma and addiction.