Strictly speaking, military is any armed force, defensive or otherwise. Unfortunately, the term "defence force" has been corrupted by many countries that use their military in a non-defence capacity, be it under the guise of pre-emptive defence, interfering in the affairs of another state or by creating a tenuous link to national interests.
I think this discussion should turn back to one of EyeR's earlier points - what reason would there be to declare war on Asgardia? It's not like there are plans to create a space weapons platform designed to rain death and destruction on those who do not agree with our ideology. War doesn't occur for the sake of it or because nations are bored: It only results from the desire to achieve a benefit or benefits after a war is concluded (military, territorial, resources, economic, etc). If it is clear from the outset to the rest of the world that Asgardia is a neutral state that is constitutionally forbidden from participating in wars and will abstain from mediation of disputes between states unless specifically requested by all parties, this reduces the risk of Asgardia being involved in any sort of armed conflict significantly... but does not eliminate it totally.
Asgardia in the future has the potential to be an economic powerhouse from the development of technology, generation of energy and production of minerals. However, if Asgardia becomes viewed as an exploitative monopoly of these things, the risk of armed conflict involving Asgardia will increase. Even if Asgardia avoids this perception, there will undoubtedly be states that will at least consider taking this economic opportunity for themselves.
This is where, I believe, it is critical that Asgardia has a plan (and means) for its defence. This should be based on the principle to either ensure that an attack on Asgardian sovereign territory would be unsuccessful, or at least, have the cost of any armed conflict aimed towards Asgardia exceed the benefits gained from it. To do this, we have to think beyond the "dudes with guns" model that many seemed to be fixated on, particularly in other similar threads.
Remember - The only winner in war is the side that loses the least.