Having a large military means that you have to spend a lot of money on the sophisticated equipment and keeping the military up to date with all the latest gadgets and lethal weapons.
Militaries around the world are always looking for a competitive advantage over there perceived enemies by acquiring such vehicles and technologies but it costs a lot of money such as Mine-Resistant Ambush Protected Vehicles program will cost the US military somewhat $48 billion.
When it comes to the aerial combat the fighter planes are very expensive especially the latest high-end fighter jets. One of the most expensive supersonic jets is F 35 that costs a fortune to build and operate.
The expensive vehicles are not only limited to the land and aerial combat the Navy has also spent billions of dollars on acquiring and operating a large fleet of submarines and frigates that are grouped with latest stealth technologies.