JOINT BASE PEARL HARBORHICKAM, Hawaii The U.S. Space Force has completed what officials describe as its largest combat training simulation to date, a multi-day exercise focused on defending satellites against subtle, hard-to-attribute interference. The event, known as Resolute Space, trained dispersed crews to diagnose faint anomalies on orbital systems, attribute likely sources, and restore services while a red-team aggressor probed for weaknesses across the electromagnetic spectrum. Unlike traditional force-on-force drills, Resolute Space centered on signals and software rather than kinetic effects. Training lanes emphasized the messy reality of modern interference: intermittent drops, noisy telemetry, and effects that could pass for routine glitches. Crews were evaluated on how quickly they detected the pattern, ruled out benign causes, and synchronized responses across units and time zones. The objective was less about theatrical kills and more about preserving decision-quality data to the joint force when comms degrade without warning. A dedicated aggressor element replicated near-peer electronic warfare techniques intended to blind or confuse ground operators without triggering obvious tripwires. Rather than jamming at full blast, the red team used tactics designed to sow doubtshort-lived disruptions, shifting signatures, and activity timed to maintenance windows. That forced blue teams to tighten their procedures for anomaly detection, spectrum discipline, and cross-unit confirmation before declaring an incident and executing restoration playbooks. The Space Force framed the exercise as a maturity test for a service still refining doctrine for a domain where adversaries move quickly and attribution is inherently difficult. Leaders emphasized three outcomes: better baselining of normal satellite behavior to recognize the abnormal; faster attribution that can withstand scrutiny; and repeatable restoration steps that keep GPS timing, missile warning, and secure communications flowing to air, land, and maritime forces facing their own contested environments. Operationally, Resolute Space also pushed culture. Guardians trained alongside specialized aggressors and intel analysts, normalizing an adversary-realistic mindset in daily operations. The exercise rewarded disciplined logging, concise escalation, and clear handoffs over showy maneuvers. It also highlighted the value of joint integration: when space links falter, fighter squadrons, carrier strike groups, and ground formations all feel the impactso restoration timelines must be measured in minutes, not hours. For industry and range partners, the message is equally pointed. As orbital constellations proliferate and software updates accelerate, the attack surface grows. Vendors who can instrument systems for better health monitoring, anomaly triage, and rapid rollback will be more competitive in future acquisitions. Conversely, platforms that cant expose trustworthy diagnosticsor that treat spectrum resilience as an afterthoughtrisk becoming liabilities in a fight. The broader strategic signal is that the first shots in a crisis may be nearly invisible: spoofed signals, ambiguous dropouts, or cyber actions that muddy commanders maps without leaving craters. Exercises that treat those effects as the main event, not a sidebar, move the force closer to real-world readiness.