What Is Fox One? The NATO Weapons Call Explained

Fox One is a standardized NATO radio brevity call that a pilot transmits at the exact moment they launch a semi-active radar-guided (SARH) missile at an aerial target. The Fox prefix signals an air-to-air weapon employment; the number identifies the missile guidance type. Fox One specifically means: a semi-active radar-guided missile is now airborne.

The call originated in U.S. military aviation training and was adopted across NATO air forces to prevent friendly fire and ensure every aircraft in the area knows a missile is in flight. When you hear or transmit Fox One, every pilot should immediately check their radar track and confirm they are not the intended target.

In practical terms, Fox One missiles — like the AIM-7 Sparrow or the R-27R Alamo — require the launching aircraft to continuously illuminate the target with its radar until the missile impacts. This is called continuous wave illumination. The shooting jet must maintain a firm radar lock and keep the nose pointed roughly toward the target for the entire missile flight time, which can range from five seconds to over sixty seconds at maximum range. Breaking that lock kills the shot.

The Full Fox Call System: Fox One, Two, and Three

There are three primary Fox weapons calls in regular use. Each corresponds to a distinct missile guidance technology. Knowing all three is essential for situational awareness in any realistic air combat environment.

• Fox One: Semi-active radar-guided (SARH) missile. The shooter must hold radar lock on the target through impact. Example weapons: AIM-7 Sparrow, R-27R (NATO reporting name AA-10 Alamo-A).
• Fox Two: Infrared heat-seeking missile. Fire-and-forget once the seeker has an acquisition tone. Example weapons: AIM-9 Sidewinder, R-60 (AA-8 Aphid), Python 5, IRIS-T.
• Fox Three: Active radar-guided missile. Fully fire-and-forget — the missile's own radar guides it after launch with no further input from the shooter. Example weapons: AIM-120 AMRAAM, R-77 (AA-12 Adder), Meteor.

A fourth historical call exists: Fox Four indicated a guns kill or deliberate ramming. In modern U.S. practice, a cannon engagement is called Guns Guns Guns rather than Fox Four, and most simulators follow this convention.

The correct radio format for any Fox transmission is: [Your callsign], Fox [number], [optional target position]. A complete real-world example: Viper 11, Fox One, bullseye 270 for 40. Bullseye refers to a pre-briefed reference point; the numbers give bearing and range in miles.

Fox One Missile Tactics: What You Must Do After the Shot

Firing a Fox One missile is only half the engagement. Because you must illuminate the target throughout the missile flight, your tactics from launch until impact are completely different from a Fox Three shot. Here is how to handle the post-shot phase correctly.

1. Plan your escape route before firing. Once you press the trigger, you are committed to pointing at the target. Decide in advance which direction you will crank or extend after the shot, because you cannot break hard without losing the lock.
2. Maintain lock discipline. Keep your radar antenna on the target. In most simulator flight models, even a brief radar break caused by a hard turn will cause the missile to go ballistic. If your target notches hard, crank to maintain azimuth coverage rather than turning fully away.
3. Know your range brackets. A Fox One fired at maximum range gives the target maximum time to evade and forces the longest illumination window on you. Shooting at medium range — roughly 60 to 70 percent of max — gives the missile better energy and cuts your exposure time significantly.
4. Expect a notching attempt. A target aware of an incoming SARH shot will immediately turn 90 degrees to your radar beam to exploit the Doppler blind spot and cause your radar to lose track. Anticipate this move and adjust your radar scan azimuth before the target gets there.
5. Call splash or continue. If the missile impacts, call Splash and your target's callsign or position so your flight knows that bandit is down. If the shot misses, call miss so no one declares victory prematurely.

How to Practice Fox Calls in DCS World Step by Step

DCS World is the most accurate consumer flight simulator for practicing Fox weapons employment. The following steps build correct habits from the ground up.

1. Choose the right aircraft. The F/A-18C Hornet and F-16C Viper are both available in DCS in a free two-week trial. Both carry the AIM-7 Sparrow (Fox One) and AIM-120 AMRAAM (Fox Three), letting you practice both call types back to back and feel the tactical difference.
2. Complete the training missions first. In the DCS main menu, navigate to Training then Air-to-Air Intercept. These scripted missions include step-by-step radio cues and teach proper radar acquisition, locking, and weapons release procedures before you take on live targets.
3. Install SimpleRadioStandalone (SRS). SRS is the standard voice comms addon for DCS multiplayer, available free at its official site. Bind your push-to-talk key before joining any server, and set your radio frequency to match the server's AWACS frequency listed in the briefing.
4. Join a structured public server. Servers such as Growling Sidewinder and the 476th Virtual Fighter Group run realistic air combat scenarios with active AWACS controllers. When you fire, transmit your Fox call live over SRS at the exact moment your thumb presses the trigger.
5. Review your track files. DCS saves .trk replay files in Saved Games/DCS/Tracks. After each sortie, replay the file and use the F-10 map view with radar contacts visible to check whether your radar held lock through impact. A miss with a clean lock means a range or geometry error; a miss with a broken lock means you maneuvered too hard.

Fox Calls in War Thunder: Key Differences

War Thunder uses a simplified radar and missile model compared to DCS, but Fox calls still apply meaningfully in realistic and simulator battle modes. Semi-active radar missiles like the AIM-7E on the F-4 Phantom II require continuous lock just as in real life and in DCS, making Fox One discipline directly transferable.

Practical differences to keep in mind when using Fox calls in War Thunder:

• No built-in SRS equivalent. War Thunder does not include voice comms for realistic weapon calls by default. Use Discord with your squadron and call your shots in the voice channel at trigger press.
• Confirm the lock on the HUD. War Thunder uses an automatic radar lock mechanic in some aircraft. Always verify the lock indicator is solid on your heads-up display before firing a Fox One shot, or you will waste the missile on a ghost track.
• Fox Two dominates at lower tiers. Many aircraft in the 8.0 to 10.0 battle rating range carry only IR missiles. The Fox Two call is therefore more frequent in War Thunder simulator battles than Fox One, but knowing the distinction builds correct habits for higher-tier jets.
• Deconfliction matters in squads. Even in a game environment, calling your Fox shot prevents two pilots from targeting the same aircraft while a third bandit goes unengaged — the same reason the call exists in real aviation.

Common Fox One Mistakes and How to Fix Them

Even experienced sim pilots make these errors. Identifying and correcting them immediately improves both your kill rate and team coordination.

• Not calling at all. Silence on the radio wastes your team's situational awareness. Make the call every single shot, even in solo training sorties, so the transmission is automatic in multiplayer.
• Calling the wrong Fox number. Saying Fox Two when you fire an AIM-7 tells teammates a heat-seeker is in the air when it is not. Before each sortie, verify your loaded weapon in the cockpit weapon select display. In DCS, the F/A-18C SMS page shows each station's weapon type.
• Breaking lock too early. The most costly Fox One error. Pulling a hard defensive break within fifteen seconds of firing a SARH missile at medium range almost guarantees a miss. Discipline yourself to hold lock — crank if you must, but do not break radar contact.
• Calling after impact. The call goes out at launch, not after impact confirmation. A post-impact call provides zero safety value to other pilots in the area.
• Wrong format. I just fired a Fox One at the bandit is incorrect. The correct format is brief: [Callsign] Fox One. Brevity is the entire point of the code system.

Essential Air Combat Brevity Calls Beyond Fox One

Fox calls are part of a broader radio vocabulary that any serious sim pilot should know. Learning these adjacent calls makes your Fox One transmissions meaningful within a complete tactical picture.

• Bogey: Radar contact of unknown identity — could be friendly or hostile.
• Bandit: Positively identified hostile aircraft.
• Splash: Your Fox shot hit — target destroyed.
• Spiked: An enemy radar is illuminating you. A Fox One is likely incoming and you should crank or notch immediately.
• Defensive: You are actively maneuvering to defeat a missile or guns attack. Tells your wingman to support rather than follow your maneuver.
• Bingo: Fuel is at the minimum level needed to return to base. Disengage now.
• Buddy spike: A friendly aircraft is illuminating you with its radar by mistake. Critical safety call — the illuminating pilot must immediately break lock.
• Blind: You have no visual or radar contact with a friendly aircraft that should be in your area. Opposite of visual (tally on a friendly) or tally (visual on the bandit).

Mastering these calls alongside Fox One transforms radio communication from background noise into a real-time tactical picture. Every transmission should be short, accurate, and delivered calmly — the same standard real fighter pilots train to for hundreds of hours before their first live sortie.