2521

2521

---

26th century

Previous: 2519 • 2520
Next: 2522 • 2523

---

For a complete list, see our timeline category.

2521 was a year in the 2520s in the 26th century.

Events

Unknown

• The Sniper Rifle System 99 Anti-Matériel is adopted by all branches of the UNSC Armed Forces because of its modularity and ongoing manufacturer support.