There are multiple definitions:

1. Certified Respiratory Therapy Technician(English)

   • NBRC
   • Respiratory system, Education

2. combat-related thoracic trauma(English)

   • a significant contributor to morbidity and mortality of the casualties from certain military operations
   • MDCT
   • Military medicine, Post-traumatic state, Respiratory system
   • https://doi.org…3/milmed/usx033