How often should the word about HERO status be passed after initial notification?

The correct choice reflects the recommended practice for maintaining situational awareness regarding HERO (Hazardous Electromagnetic Radiation to Ordnance) status. After the initial notification of HERO status, it is essential to communicate updates at regular intervals to ensure that all personnel remain aware of the potential risks associated with electromagnetic radiation and its impact on the ordnance on board.

Passing the HERO status every 15 minutes allows for timely updates and ensures that any changes in the situation are effectively communicated to those affected. This frequency helps to maintain vigilance and encourages proper safety measures among the crew. It is crucial for personnel to remain informed, especially when operating in environments where electromagnetic emissions could pose a threat to ordnance safety.

The other options provided suggest longer intervals for updates, which may not adequately support the necessary level of awareness and responsiveness required in these situations.