Short Answer 
TSgt Holland should first cover her mouth and nose to prevent inhalation of a biological agent, then evacuate the area while warning others. After leaving the vicinity, she must seek medical attention and wash any exposed areas to decontaminate.
Step 1: Cover Your Mouth and Nose
If TSgt Holland suspects exposure to a biological agent, the first action she must take is to cover her mouth and nose. This is important to help prevent the inhalation or ingestion of the biological agent, reducing her risk of further contamination. She can use a mask or any cloth material available to provide a barrier against the agent.
Step 2: Evacuate Swiftly and Warn Others
Immediately after covering her mouth and nose, TSgt Holland should evacuate the area quickly. It’s essential to clear the vicinity to minimize further exposure risk not only for herself but also for others. While evacuating, she should warn anyone nearby about the potential biological threat, ensuring that they are aware and can take their own precautions.
Step 3: Seek Medical Attention and Clean Affected Areas
After vacating the area, TSgt Holland should seek medical attention as soon as possible. A healthcare professional will provide necessary testing and treatment for possible exposure to the biological agent. Additionally, she should wash any exposed skin and areas that may have come in contact with the agent using soap and water to help decontaminate and reduce any potential health risks.