NCR Emergency Radio

The NCR emergency radio is a "miscellaneous item" in Fallout: New Vegas.

Location
You receive this from an approaching unnamed NCR Ranger (at NCR controlled areas) when your Reputation with the NCR becomes accepted or higher. You can not reject him giving it to you, as well as it can't be dropped, it's considered a quest item.

Characteristics
In the Aid tab of your Pip-Boy, you may select the NCR Emergency Radio. After selecting, you will see a menu with options to:
 * Call for NCR supply support
 * Call for NCR trooper support
 * Call for NCR Ranger support
 * Cancel (No Support).

The radio can be used every twenty-four hours.

Supply Support
Calling for supplies starts the quest Emergency Radio, which drops an NCR supply crate with random ammunition, and/or armor in the near vicinity. Sometimes an NCR Ranger will run to you after completion, and go through the same dialogue as when you received the radio. (Note that you will not be given an additional radio.)

Calling for Trooper Support
Calling for Trooper Support summons an unnamed NCR trooper to run to your location. He/She cannot be controlled by the companion wheel, but will follow you as a companion. The Trooper will still be present after fast-traveling. The trooper is always equipped with NCR armor and a service rifle. He/She has 50 Hit Points and a Guns skill of 46. The support can be dismissed via the radio.

Calling for NCR Ranger Support
This causes an unnamed NCR Ranger to run to your location. The ranger works similarly to the trooper, but will have better gear and stats. He/She are equipped with NCR Ranger patrol armor and a cowboy repeater, and have 220 Hit Points, and a Guns and Unarmed skill of 100. The ranger also carry $50 NCR. Like the trooper, the ranger can be dismissed via the radio.

Bugs

 * Calling for a supply drop in certain areas may lead to the cache not spawning at all, or spawning underground or in non-accessible areas, leading to never being able to get supply drops again. On the PC this can be resolved by using the command code.
 * Sometimes after dismissing a support Ranger, they can be found at Camp McCarran and talking to them will result in the Ranger joining your party again. It becomes impossible to dismiss them through the radio after this.
 * It has been found that for some users, the radio will never recharge after use and many aspects of the radio seem to function poorly. This is caused by the glitch that makes the NCR Ranger/Trooper you called in respawning. To fix this glitch find and talk to the Trooper/Ranger causing them to follow you. They can be found at the area where they died. This procedure will need to be repeated every several days.
 * If you have an NCR trooper or Ranger following you, they will be shot at by the Securitrons guarding the gate to the Strip, as they most likely do not have clearance to enter. Note: this does not cause the Securitrons to be hostile towards you.
 * The Ranger or trooper may stop following you or just disappear when you enter a building.
 * Occasionally after a fight a Ranger may freeze in their position. They will not move until attacked but may freeze again the moment the danger has passed.
 * If you use items from the aid section fast enough you can "Eat" your Radio.
 * After the NCR Ranger dies, returning to the location several days later, the player can find that the Ranger is alive again, and upon speaking to her, she will follow the player again.
 * Sometimes, when initiating the "Call of Supply Support" option, the drop will happen as usual. However, upon searching the drop, the container will have nothing inside it. You will still complete the quest and another NCR Ranger will give you another Emergency Radio.
 * Summoning the NCR trooper may only work once. After 24 hours, the option to call for the trooper will no longer be present. Even if you dismiss him within the 24 hour time-frame, the option to call the trooper will still not be there. Only way to work around this is to have him die while traveling with you, then the option will renew as normal. However, the glitch still remains so the only way to re-summon the trooper is to have him die each time. Also, if you summon the NCR Ranger after dismissing the trooper, it will only give you the option to dismiss the trooper, NOT the Ranger. This makes it impossible to dismiss the Ranger.
 * Having a Trooper or Ranger following you and using the Big Mountain Transportalponder can cause them to travel with you to the Big MT.
 * Sometimes when you call for Ranger support the Ranger will not appear.
 * Calling for support in the Mojave Outpost (to the east, close to the edge of the outpost) may result in either the trooper or Ranger dying.
 * If the player has a bad reputation with the Gun Runners, and goes to the Gun Runners shop, the Ranger or Trooper following becomes hostile and reputation with NCR is lost if the follower is killed even if not by the player.
 * Sometimes when calling for support, the reputation with both the NCR and the Legion will reset to Neutral. They will still attack the player if he/she has done bad deeds for the faction.
 * When going through the strip gate with either Ranger or trooper will cause a continuous loop causing them to be killed by the gatekeepers.
 * If there are mountains nearby, the Ranger/Trooper will often spawn inside the mountain, unable to get out.
 * The Boomers will bombard you and your NCR trooper or Ranger if you run through their artillery bombardment.
 * If the Ranger dies and you call in another one, the body will disappear and the new one will come in. This is likely because the Ranger that comes to you is always the same person so calling them in will just relocate them and respawn them.
 * The summoned Trooper/Ranger is not affected by the Animal Friend perk like normal companions so bringing them close to animals will allow you to obtain infinite amounts of whatever they're holding. Of course this not the case if they manage to kill them all. It is suggested to enter an area with incredibly strong animals or just medium level animals and pick-pocket their ammunition. It also helps for them to be in packs.
 * It is possible to never receive the NCR Emergency Radio even if you are Idolized by the NCR. NOTE: Patching may resolve this bug (Confirmed after doing so, three previous play-troughs prior where I did not receive radio). If this happens on the PS3, fast-traveling to the entrance of Vault 34 will cause the Ranger to spawn outside. It should be noted that there are usually between four and five golden geckos outside the Vault, and they may kill the Ranger if they are not killed first, or drawn away from the Ranger.
 * Sometimes the ranger who gives the player the radio can do it multiple times and they can even be as soon as one after another.
 * When the player returns to the spot where he/she received the radio, the ranger who gave the player the radio might be standing at the point. If you talk to him, he will repeat the previous dialogue, but you don't get another radio.Note this can also happen when you first recive it.
 * When the player has the ranger and trooper you can go into Vault 3 and passing the speech check and nether the Fiends or NCR with you will attack until you walk near the other Fiends in the back but they still wont be hostile to you.