1, Navy: You can use Lego bricks to build naval vessels such as ships, submarines and aircraft carriers, you can add small Lego figures as crew members, and you can also use other Lego elements to add details, such as weapons and radar equipment on board.
2. Army: You can use Lego bricks to create army equipment, such as tanks, armored vehicles and infantry. You can use Lego characters as soldiers and add other Lego elements to add battlefield scenes, such as sandbags and fences.
3. Air Force: Lego bricks can be used to build air force equipment such as fighters, helicopters and drones. You can use Lego characters as pilots and add other Lego elements to add airport scenes, such as runways and control towers.