What are two essential factors that contribute to success in combat?

The correct answer highlights the importance of night training and adverse weather training as critical factors that contribute to success in combat. Both night and adverse weather conditions pose significant challenges during military operations, and being adequately prepared for these situations can dramatically enhance a unit's effectiveness and survivability.

Night training is essential because combat operations often occur during low-light conditions, where visibility is severely limited. Soldiers who have trained extensively in nighttime operations are better equipped to navigate, employ tactics effectively, and maintain situational awareness, which is crucial for mission success.

Adverse weather training is equally vital because harsh conditions such as rain, snow, or extreme temperatures can affect equipment functionality, troop morale, and operational momentum. Training under such conditions prepares soldiers to adapt and overcome potential setbacks that weather might impose.

In combination, these training elements ensure that units are not only prepared for ideal conditions but can also perform effectively in challenging environments, facilitating an overall greater chance of mission accomplishment and survival on the battlefield.