What term on the radio means you understand a request and will do what they ask?

The term that signifies both understanding a request and agreeing to carry out the instruction is "Wilco." This expression is a combination of "will" and "comply," indicating that the receiver has acknowledged the message and intends to follow the directives provided. In aviation and emergency communication, clarity and precision are essential, making "Wilco" particularly valuable in confirming actions that will be taken.

While "Roger" indicates that a message has been received and understood, it does not explicitly state that the recipient will take any specific action. Similarly, terms like "Affirmative" and "Understood" convey acknowledgment but do not imply a commitment to comply with the request. Therefore, "Wilco" is the most appropriate choice when one intends to confirm understanding and indicate a willingness to act accordingly.