Judgmental language is a subset of red herring fallacies. It employs insultive, compromising or pejorative language to influence the recipient's judgment.
This argument combines judgmental language also with Non sequitur and appeal to authority.
Here the judgmental words are "our very own sons" (suppose you are childless or have only daughters?) and "mercenaries", which imply not only professional soldiers but rather soldiers of fortune. This argument is also a false dilemma: nothing implies that coercion and fear of punishment produces better soldiers than voluntarity, and that a professional army could not be assembled from the nation's own citizens.