Final answer:
Maintenance personnel training frequency is not specified in the references, but parallels to the management of overseas ballast water and laboratory safety suggest regular re-training, potentially annually, to ensure safety and readiness.
Step-by-step explanation:
The frequency of required training for maintenance personnel, such as egress/explosive system training, particularly within the context of the military or other organizations working with heavy machinery and vehicles, is vital for maintaining operational safety and readiness. While the specific question about the frequency of training after initial instruction upon reporting aboard is not directly answered within the provided reference materials, we can draw parallels to similar safety protocols like those for handling ballast water (BW) and laboratory safety standards. Regular training and re-certification are common practices in industries where safety is critical.
For example, regarding the management of overseas ballast water (BW) discharge, which is closely monitored, there are strict reporting and management requirements overseen by the United States Coast Guard (USCG) and the United States Environmental Protection Agency (US EPA). Commercial ships are required to submit detailed Ballast Water Reports (BWR), which include information on BW history and management. These practices indicate an industry standard of vigilance and ongoing accountability to prevent environmental contamination and biological invasions, which can be similar in rigor to that of safety training frequencies.
Furthermore, in laboratory settings, personnel are expected to know the location of emergency safety equipment, such as fire extinguishers and eyewash stations. This familiarity is often reinforced through periodic safety training or drills. Drawing from these examples, one could infer that scheduled re-training or checkouts for egress/explosive systems would likely occur regularly, possibly annually, or as required by specific occupational safety guidelines in similar high-risk environments.