Namely, a commentator at a new blog argues that it's wrong to acknowledge Memorial Day inside the Church, or indeed to call our troops "our" troops, and broadens into a full fledged condemnation of patriotism, all from a putatively Catholic perspective.
Details are here. Victor's rebuttal in the comments is especially helpful.
The most charitable comment I have for this line of thinking is that it is blinkered. More importantly, it is not particularly Catholic, as the Catechism demonstrates:
The duties of citizens
2238 Those subject to authority should regard those in authority as representatives of God, who has made them stewards of his gifts: "Be subject for the Lord's sake to every human institution. . . . Live as free men, yet without using your freedom as a pretext for evil; but live as servants of God." Their loyal collaboration includes the right, and at times the duty, to voice their just criticisms of that which seems harmful to the dignity of persons and to the good of the community.
2239 It is the duty of citizens to contribute along with the civil authorities to the good of society in a spirit of truth, justice, solidarity, and freedom. The love and service of one's country follow from the duty of gratitude and belong to the order of charity. Submission to legitimate authorities and service of the common good require citizens to fulfill their roles in the life of the political community.
2240 Submission to authority and co-responsibility for the common good make it morally obligatory to pay taxes, to exercise the right to vote, and to defend one's country:
Pay to all of them their dues, taxes to whom taxes are due, revenue to whom revenue is due, respect to whom respect is due, honor to whom honor is due.
[Christians] reside in their own nations, but as resident aliens. They participate in all things as citizens and endure all things as foreigners. . . . They obey the established laws and their way of life surpasses the laws. . . . So noble is the position to which God has assigned them that they are not allowed to desert it.
The Apostle exhorts us to offer prayers and thanksgiving for kings and all who exercise authority, "that we may lead a quiet and peaceable life, godly and respectful in every way."