They are little trinkets that you can find and turn in to their respective syndicates (at Relays/Tenno Hubs) to redeem syndicate standing.

Where do I find them?
– Any of your daily syndicate missions.
– For a collection of scrrenshots of missable medallion locations,

How do I find them?
Do they drop from enemies?
– Nope.
Do they drop from containers?
– Nope.
Do they fall from the sky?
– …
– They’re just lying around in some dark corner somewhere.Common Medallion (500 standing): No Glow
ex) Insignia (Steel Meridian)

Uncommon Medallion (1000 standing): Glowing Aura
ex) Defender Insignia (Steel Meridian)

Rare Medallion (5000 standing): Glowing Aura and Beam of Light
ex) General Insignia (Steel Meridian)

How many can I find per mission?
Depends. Based on the wiki and forums, the mission type and tileset affects the number of medallions. Mission can spawn up to 8 medallions or none at all. Rare instances of mission spawning any number of medallions between 0 and 8, even just 1.
*To help out with this section, post a comment below on how many medallions spawned for each mission type as well as the tileset the mission took place.

  • [CGC] Corpus Gas City: 0 – 8
  • [CIP] Corpus Ice Planet: 1 – 3
  • [CO] Corpus Outpost: 2 – 8
  • [CS] Corpus Ship: 0 – 8
  • [GA] Grineer Astroid: 0 – 8
  • [GF] Grineer Forest: 0 – 8
  • [GG] Grineer Galleon: 0 – 3
  • [GSe] Grineer Settlement: 0 – 8
  • [GSh] Grineer Shipyard: 0 – 8
  • [IS] Infested Ship: 0 – 8

    Mission Type CGC CIP CO CS GA GF GG GSe GSh IS
    Capture 8 3 8 8 8 3 3 8 8 8
    Crossfire X X X 8 X X 8 X X X
    Deception 8 X X 8 X X 3 8 8 X
    Defense .0 1 2/3* .0 .0 .0 .0 .0 .0 .0
    Excavation X 3 8 X X 8 X 8 X X
    Exterminate 8 3 8 8 8 3 3 8 8 8
    Hijack X 1 X X X X X X 8 X
    Hive Sabotage X X X X X X X X X 8
    Intercept .0 1 3* .0 .0 .0 .0 .0 .0 X
    Mobile Defense 8 3 8 X 8 X 3 8 8 8
    Rescue X 3 8 8 8 X 3 8 8 8
    Sabotage 8 3 8 8 8 3 3 8 8 X
    Spy X 3 8 8 X X 3 8 X X
    Survival 8 X X 8 8 X 3 X 8 8

    * The ‘Courtyard’ map (two tall stuctures on either side of the cyropod, tall tower in the back, and large cliff-face in the front) can have up to 2 medallions (all found in the large tower: 1 at the top floor just outside the room and 1 in the room right below).
    * The ‘Dam’ map (large pit in the middle with longs bridges connected in a rectangle) can have up to 3 medallions (found at the bottom: 2 inside the lowest orange cargo-containers and 1 laying outside next to a closed door).

    *sidenote: Getting more than 1 rare medallion per mission is possible.

Change? Er, tips? Tips…
  • What should I bring?
    – I can not stress this enough, BRING A MOD WITH LOOT RADAR!!! Medallions will show
    up on the mini-map with the following mods:
    -> Thief’s Wit (Warframe Mod)
    -> Loot Detector (Warframe Aura Mod)
    If you can, bring both! Some medallions can be hidden outside the range of your loot radar if
    you’re only using one.
  • Where should I look?
    – Run around the map like a mad man and search every nook and cranny! But mostly bee-line
    from one loot marker on your mini-map to the next.
    – Keep in mind that some mission may not have medallions (e.g. Corpus Ship Defense). So no
    need to panic if you couldn’t find any.
    – Try to stealth or turn off the alerts/alarms as frequent as possible. Those pesky control console
    icons can end up covering up loot icons that can potentially be medallions.
    – Utilize wall running, air dashing (quick melee while in mid-air), and coptering (quick melee while
    ground/air sliding) to get to hard to reach places.
  • Squad or Solo?
    – Try form groups that will assist in hunting dem medallions and not rush to extraction. Or just go
    solo and take your sweet, sweet time.
    – If you do plan on hunting as a group, EVERYONE has to pick up the medallion themselves or
    they won’t get it. So be sure to waypoint medallions for everyone.
    – If you join a mission mid-game and the host (or everyone in the squad, not sure) has already
    picked up a medallion, that medallion won’t spawn in your game. So it is really recommended to
    form your own squads or play solo.
    – Only people who have access to and still hasn’t done the mission yet will see the medallions.
  • Not satisfied with finding only common medallions?
    – Well you can always restart and try again! Each time different medallions will generate on the
    map (same number of them too so maybe it isn’t all random?). Who knows, you might end up
    finding a rare medallions 😉 (that’s 5,000 syndicate standing!!!)
    – Do keep in mind though, that quantity doesn’t mean quality. Sure you’ll have more chances at
    getting a higher rarity medallion, but 1 rare = 5 uncommon = 10 commons. So a run with only 5
    6 medallions could potentially be worth more than a run with 8.

Hope this short guide helps and happy hunting Tenno! ❤