Final answer:
Mr. Lambers' actions align with Kohlberg's post-conventional stage of moral development, characterized by placing ethical principles above laws when they do not coincide.
Step-by-step explanation:
Mr. Lambers' refusal to pay income taxes because he does not want to support a government that spends billions on military weapons best illustrates Kohlberg's post-conventional stage of moral development. At this level, individuals think of morality in abstract terms and recognize that legality and morality do not always align. This stage of reasoning involves evaluating the legitimacy of laws and principles and acting upon one's conscience and ethical principles, even at the risk of facing legal consequences. Mr. Lambers' actions show he prioritizes his ethical beliefs over societal norms and legal requirements, which aligns with the characteristics of the post-conventional stage.