F-15SA Development Aircraft Used to Test AGM-84 Harpoon Block II Update

Key Takeaways

• Final Harpoon Block II test completed using Saudi F‑15SA.
• GPS/INS upgrade enables land‑target strike and waypoint navigation.
• Navy plans deliveries of updated missiles later in 2026.
• F‑15SA and F‑15K remain only F‑15s with Harpoon capability.
• LRASM integration may give U.S. F‑15s similar anti‑ship role.

Summary

The U.S. Navy completed the final flight test of the AGM‑84 Harpoon Block II Update on Jan 16 2026, using a Boeing‑operated F‑15SA (tail 12‑1002) from Point Mugu. The test demonstrated successful coastal target suppression against a land target, confirming the GPS‑aided navigation and inertial‑measurement upgrades that enable waypoint‑guided, sea‑skimming and terminal‑dive attacks. The Block II redesign, initiated in 2025, is now nearing full‑scale production with deliveries slated for later 2026. The F‑15SA and South Korean F‑15K remain the only F‑15 variants capable of launching the Harpoon, while the Navy evaluates LRASM integration for U.S. F‑15s.

Pulse Analysis

The Harpoon Block II Update represents a significant evolution of the decades‑old anti‑ship missile, adding GPS‑aided inertial navigation and a low‑cost IMU borrowed from JDAM. These enhancements allow the weapon to execute complex flight profiles—sea‑skimming, waypoint sequencing, and a steep terminal dive—while also engaging static land targets. By modernizing guidance electronics rather than redesigning the airframe, Boeing delivers a capability boost at a fraction of the cost of entirely new missiles, preserving the Harpoon’s relevance in contested littoral environments.

F‑15SA operators in Saudi Arabia and the Republic of Korea’s F‑15K fleet are uniquely positioned to field this upgraded missile, giving them a rare combination of air‑superiority performance and maritime strike power. The ability to launch Harpoons from a high‑speed fighter expands the reach of regional navies, supporting deterrence strategies across the Red Sea, Persian Gulf, and East Asian seas. As allies evaluate force‑mix options, the proven integration of the Block II on the F‑15 platform underscores the value of leveraging existing aircraft to field advanced weapons without costly new procurement.

Looking ahead, the Navy’s parallel pursuit of LRASM integration on U.S. F‑15E and F‑15EX aircraft signals a broader shift toward stealthier, longer‑range anti‑ship solutions. While LRASM offers superior range and low observability, the Harpoon Block II remains attractive for customers prioritizing affordability and proven performance. The imminent 2026 delivery schedule will likely spur export interest, especially among nations modernizing legacy fleets, and could shape future missile procurement dynamics in a region where maritime dominance remains a strategic priority.