This study will focus on researching the methods and requirements for response to an injured crewmate while performing extra-vehicular activities (EVAs). This will generally require three to five crew members depending on the scenario being tested. The suggested scenarios are: loss of suit pressure (LSP), loss of visibility (LV), and injured low extremity (ILE). This study falls into two categories; one is focused on the human response and capabilities during an EVA emergency; the second is focused on procedural development of emergency responses to urgent or emergency EVA scenarios. One crew member has operational experience in emergency medical response, two crew members have experience testing and developing emergency EVA response in analog environments (Hawaii Space Exploration Analog and Simulation [HI-SEAS] and The University of North Dakota’s Human Spaceflight Laboratory’s Lunar/Martian Analog Habitat [LMAH]). Development of emergency response procedures is vital to the future development of manned planetary exploration and currently not well defined. Some previous work at the Mars Desert Research Station (MDRS) and in the Artic with the Dr. Pascal Lee on the Haughton-Mars project has been accomplished and provides an initial understanding of some requirements and procedures for emergency EVA response. The group will test each scenario while on EVAs testing all three scenarios on each of these EVAs three times with various crew compositions. To further gain an understanding three different EVA teams will be put together to test. This will require three EVAs of approximately 2 hours to complete the full rounds of testing. For example EVA 1 will have three EVA crew members with one habitat support crew member and will perform each test (LSP, LV, ILE) three times with data collection on the amount of time each activity took, percentage success, and the crews general impressions of the procedure. This will then occur for two more EVAs with different crew members in each position.