The government or military might use the technology described in patent US1338343A for several strategic purposes:

Concealment: Creating artificial fog or clouds could be used to obscure military operations, hiding troop movements, naval ships, or air bases from enemy observation, particularly from aerial reconnaissance or surveillance.

Defense: A dense fog could serve as a protective screen against attacks, making it difficult for enemies to target or navigate through the obscured area, potentially protecting key military installations or assets.

Deception: By generating artificial weather conditions, military forces could mislead opponents about their positions, numbers, or intentions, creating a tactical advantage through misdirection.

Psychological Warfare: The sudden onset of unnatural weather phenomena could have psychological effects on enemy forces, possibly inducing confusion or fear, thereby lowering morale or combat effectiveness.

Training: Such technology could also be used in training scenarios to simulate various visibility conditions for troops, enhancing their ability to operate under diverse and challenging weather conditions.

These uses would primarily be centered around gaining a tactical or strategic advantage in military operations, either by direct application in combat scenarios or through enhancing the capabilities of military personnel in training and simulation contexts.