First, there's three big things militarily "wrong" with the picture.
One is that Shrub Bush, of course, used Air National Guard service, quite sporadically, to avoid Vietnam. Two is that the draft had ended before Obama graduated high school and thus he was not subject to Selective Service call-up.
And three is that Reagan, while in the Reserves even before World War II started abroad, let alone Pearl Harbor, was blind as a bat, never saw actual military work, and spent most of his active duty time making war movies, to be followed 25-50 years later by ongoing massive self-deception that he had in fact fought in World War II.
There's three things wrong with the attitude of the person who posted it, too. This gentleman, a Rev. Kevin Wenker is a pastor in the Lutheran Church-Missouri Synod, the main denomination of the conservative, even fundamentalist, wing of Lutheranism. (This, and his Facebook posts in general, are posted as "public," therefore, per my standards about social media and blogging or resharing, I'm not violating any privacy.)
The first thing wrong is a selective lack of respect, which is addressed in this gentleman's scriptures by Romans 13:
1 Let everyone be subject to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God. 2 Consequently, whoever rebels against the authority is rebelling against what God has instituted, and those who do so will bring judgment on themselves. 3 For rulers hold no terror for those who do right, but for those who do wrong. Do you want to be free from fear of the one in authority? Then do what is right and you will be commended. 4 For the one in authority is God’s servant for your good. But if you do wrong, be afraid, for rulers do not bear the sword for no reason. They are God’s servants, agents of wrath to bring punishment on the wrongdoer. 5 Therefore, it is necessary to submit to the authorities, not only because of possible punishment but also as a matter of conscience.
6 This is also why you pay taxes, for the authorities are God’s servants, who give their full time to governing. 7 Give to everyone what you owe them: If you owe taxes, pay taxes; if revenue, then revenue; if respect, then respect; if honor, then honor.