We take the stand of non-combatant in the realms of war, as it occurs in our day, seeing that we are sojourners and strangers in this world; and citizens of a greater kingdom which is not from hence. Throughout the Tanakh, we will not deny that Yahweh's will was for Israel to drive out the heathen nations, but only when Israel was on right standing before Him as a nation. In our day and age, we know of no nation which, as a whole, stands justified in her actions before Yahweh. Were we to partake in battle and weapons of mass destruction, we would be supporting a cause and a country whose steps are turned aside, and would therefore be fighting against our Elohim, Yahweh, whose "kingdom is not of this world: if His kingdom were of this world, then would His servants fight... but now is His reign not from hence." (Jn.18:36)
Protection of one's family and brethren in the belief, on the other hand, is acceptable, and even a Scriptural command, for "Greater love no man has than this, that he lays down his life for his friends" (Jn 15:13), "He who does not provide for (or protect) his own is worse than an unbeliever" (1 Tim 5:8), and again, "Inasmuch as we have done unto one of the least of these my brethren, ye have done it unto Me." (Mt 25:40) We believe that we MUST oppose powers and principalities; resisting satan so that he flees from before our face (James 4:7), yet we must also first be right before Elohim, or He will stand as an adversary against us.