The Holy See’s diplomatic posture toward the United States—especially in contexts touching “defense,” war-prevention, and the arms race—appears, in the Church’s own diplomatic messaging, to follow a consistent protocol: it refuses to reduce diplomacy to power politics, and instead treats diplomatic relations as a moral and humanitarian forum for dialogue oriented toward peace, human dignity, and the common good.1 That principle strongly shapes how the Holy See would approach (and limit) what it participates in during U.S. defense engagements, even though the sources provided here do not document case-specific operational “protocols” for particular defense meetings or exercises.

1) The guiding principle: a “unique” diplomatic relationship, not an extension of political deals

A core protocol-level idea—repeated across Holy See diplomatic addresses—is that the Holy See’s relations with States are not meant to mirror ordinary political/economic bargaining. Pope John Paul II explains to an ambassador that relations between the Holy See and States/international agencies are “absolutely unique” and should not be confused with political, economic, or cultural agreements.1 The Holy See’s mission is governed by Christ’s rule: “Render to Caesar…” and “to God…”—meaning the Church and its diplomatic activity have a distinct object that is not reducible to state interests.1

Similarly, Pope Paul VI frames the Holy See’s relations as having a distinctive character in the “family of nations,” emphasizing the Church’s original place and reiterating the same Gospel principle.2

Assessment: In “defense engagements,” this would translate into a protocol of moral clarity with institutional restraint: the Holy See can engage dialogue that touches security questions, but it should not be read as aligning itself with (or legitimizing) purely strategic objectives.

2) The substantive diplomatic focus: human dignity, peace, and constraints on the arms race

When the Holy See describes its diplomatic engagement with the U.S., it repeatedly highlights peace and the moral evaluation of security policy. In welcoming the first U.S. ambassador after diplomatic relations began, Pope John Paul II specifies that Holy See collaboration includes defending “human dignity and the rights of the human person” and addressing peace and development concerns, including “the arms race,” “world hunger,” refugees, and the plight of the poor.3 He also describes diplomacy as an exchange of ideas on world peace and development rooted in freedom, justice, and truth.3

In a later address to U.S. leadership, John Paul II again stresses that the Holy See has “no political ambitions” but is “vitally concerned” about human rights and the dignity of all, especially the poor and suffering, and that diplomatic relations aim to facilitate dialogue on the international community’s basic questions.4

Assessment: The Holy See’s “protocol” in defense-adjacent matters is not procedural secrecy or militarized engagement; it is an ethically targeted dialogue—what security policies do to persons and peoples, whether they serve peace, and how they treat the weak.

3) Method of engagement: dialogue for justice and peace, not partisanship

The Holy See’s diplomatic method emphasizes “understanding” and dialogue. To a U.S. ambassador, John Paul II states that a “primary purpose of diplomatic relations” is promoting a “spirit of understanding” essential for “true justice and peace.” He adds that the Holy See engages this forum “not for political purposes” but to serve principles and values underlying the common good.5

Likewise, Pope John Paul II links diplomatic relations with practical cooperation and mutual understanding on issues of common interest.6 The tone is consistently constructive and non-adversarial.

Assessment: During U.S. defense engagements, the Holy See’s protocol is best understood as dialogical rather than instrumental: it seeks to influence the ethical horizon of policy (human rights, justice, peace), while avoiding a posture of being treated as a military-political actor or negotiating partner for coercive advantage.

4) Practical implications for “defense engagements” (what the protocols likely require)

Because the provided sources do not describe operational steps in a given U.S. defense scenario, the most responsible assessment is to infer likely protocol requirements from the Holy See’s stated objectives and constraints:

1. Scope limitation: discussions should be framed around peace, protection of persons, and humanitarian/ethical concerns—not around endorsing force as such. This follows the “unique relations / not political-economic agreements” principle.1
2. Human-rights orientation: engagement should foreground the dignity of every human person and attention to victims of conflict and broader suffering (e.g., oppression of the weak, refugees, and the arms race).^{^8}
3. Non-partisanship: the Holy See’s diplomacy is not to be mistaken for political ambition or alignment; it is described explicitly as lacking political ambitions and aiming at dialogue.4
4. Truth/justice/freedom as constraints: the Holy See explicitly ties its common concerns to freedom, justice, and vindication of truth, suggesting that any defense-related engagement must be judged against these moral criteria.3

5) Where the analysis is necessarily limited

The question asks to “assess the Holy See’s diplomatic protocols during U.S. defense engagements.” The sources provided here are principial and general—they describe the Holy See’s purpose and character in diplomatic relations with the U.S., and its moral priorities (peace, dignity, arms race, refugees, justice). They do not provide evidence about:

• specific procedural protocols (e.g., formal clearance steps, rules of engagement for visits/meetings),
• whether and how military officials are involved,
• how the Holy See handles classification-like information, or
• the exact stance taken in named “defense engagements.”

So, the assessment above is strongest as a normative and interpretive account of what the Holy See’s own diplomatic logic implies for defense contexts.

Conclusion

From the Church’s diplomatic teaching in the provided sources, the Holy See’s approach to U.S. defense-adjacent matters is governed by a clear protocol logic: preserve the uniqueness of Holy See diplomacy, avoid political-military ambition, and conduct dialogue with moral and human-rights purposes—especially concerning peace and the arms race.1 3 4 2 If you want a more concrete “protocol during engagement” assessment (case-by-case), you would need a specific incident or document describing the engagement; the current sources support principles, not detailed operational procedures.