Generate text that refutes this claim: Gun ownership increases national security within democratic states  “A well-regulated Militia, being necessary top the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.” – 2nd Amendment to the U.S. Constitution. [1] Any country is much more able to defend itself from aggression if many of its citizens are able to use guns, keeping them for leisure and sporting use. Some countries actively require adult citizens to maintain weapons in their house, and periodically to train in their use. The high levels of firearm availability in Iraq and Afghanistan have been significant contributory factors in allowing for a viable insurrection to form which has the potential to generate the political pressure necessary to cause the withdrawal of foreign occupiers.  Of course, such widespread ownership of weapons is also a safeguard against domestic tyranny.  [1] See also DIstricxt of Columbia v Heller, 554 U.S. 570 (2008)
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The 2nd Amendment of the U.S. Constitution was written in the age of horse and musket, where a private citizen could gain access to the same (or even better) weaponry that the state did.  Unless the opposition want to remove all barriers on gun ownership completely, no armed citizenry can seriously compete with a modern military armed with tanks, drones and precision weaponry. Popular resistance movements rely upon creating an unaffordable political cost to maintaining the occupation (e.g. The US was eventually forced from Vietnam, despite winning virtually every major battle of the war), but this assumes that the occupying power is vulnerable to that kind of pressure. An undemocratic invader or a domestic tyranny will happily slaughter dissidents with impunity (see the pre-intervention stages of the Libyan civil-war and the 2011 Syrian uprising).