Terrorism

• Terrorism is a form of guerrilla warfare designed to inflict confusion, disruption and fear. As of 2010, Homeland Security under President Barack Obama's administration plans to provide $5 billion in assistance to battle global terrorism.
  
  

Biological

• The use of improvised biological weapons is another type of security threat. To combat biological warfare as well as epidemics, the United States plans to utilize international resources to quickly and efficiently create new drugs, vaccines and diagnostic tests.
  
  

Nuclear

• Nuclear weapons have been a threat to national and global security since their creation during World War II. Protecting nuclear material stockpiles against theft or intrusion is one way to help prevent nuclear war.
  
  

Cyberspace

• As the U.S. becomes more integrated through network systems, it becomes more vulnerable to cyber terrorism, a form of network terrorism aimed at targeting infrastructure such as financial institutions and power facilities.
  
  

Transportation

• Transportation security is also important for preventing other forms of security threats. Protecting shipments of good and services on the ground and in the air can help prevent drugs, weapons and people from sneaking into the country.