This appears to be the same campaign that is included with the A-10C purchase (but only for the A-10C) and modified to replace the A-10C with the A-10CII.

Link: https://www.digitalcombatsimulator.com/en/files/3312919/

Cost: Free

Requirements:

• A-10CII

Mission: "Push 0-0" - Cold Start

This is a simple introductory flight where you fly over somewhat friendly airspace and are given an introduction to the area.

You'll cold start, take-off, use waypoints and land.  You may need to use countermeasures in some situations.

Mission: "Push 1-2" - Hot Start on Runway

This mission is all about taking out a bridge in enemy territory.  Fairly simple, has some ground to air targets that can hit you.

This seems simple, I was able to finish this the first time I tried, but failed repeatedly at subsequent attempts.

Mission: "Push 1-3" - Hot Start on Runway

This mission is about taking out some Artillery that is coming south.  There are a few tanks as well as some Su25s to worry about.

This used to be a paid campaign but has moved to freeware since it is no longer maintained by the original author.

Link: https://www.digitalcombatsimulator.com/en/files/3312814/

Cost: Free

Requirements:

• A-10CII

Community Notes

Reported to have a more authentic mission design when compared to The Enemy Within, but its not updated which can lead to issues flying the missions when updates to DCS break compatibility.

Missions that are not working can apparently be fixed via the mission editor.  People are trying to maintain it but it seems that it can be pretty buggy at times depending on the patches that come out for the game.

Join Operation Persian Freedom for the A-10C Warthog and the A-10C II Tank Killer and take on the role of RAF exchange pilot Flight Lieutenant David ‘Steep’ Hill as he joins the US 74th Fighter Squadron on the eve of the invasion of Iran.

This story driven campaign is set in the Persian Gulf during the Arab Spring of 2011 and explores a scenario where civil unrest in Iran has resulted in the violent repression of it’s citizens. This chain of events has led to the formation of a US led coalition with a mandate to invade Iran and remove the Iranian government from power.

During this 16 mission campaign you will experience an immersive battlefield as you fight alongside coalition air and ground forces. The invasion of Iran will unfold in compelling detail through a recurring cast of characters and intense combat.

Campaign features:

• 16 immersive, story driven missions.

• Variety of mission types, including search and destroy, killbox patrols, alert tasking for CAS, preplanned strikes and SCUD hunts.

• Customised wingman commands for more reliable AI behaviour.

• Custom JTAC system for more immersive control of attacks.

• Fully voice acted with 3500 audio files recorded.

• Optional dialogue choices that drive story and character development.

• Detailed briefing documents and kneeboards.

Includes campaign versions for both the A-10C and A-10C II, with specific loadouts and kneeboards for each version.

Link: https://www.digitalcombatsimulator.com/en/shop/campaigns/a-10c_operation_persian_freedom_campaign/

Cost: $12.99 USD

Author: Ground Pounder Sims

Requirements:

• A-10C / A-10CII

• Persian Gulf Map

Community Notes:

Full scale war scenario, very little learning curve.

This is harder than "The Enemy Within 3.0".

This is shorter than "The Enemy Within 3.0".

The Enemy Within 3.0 is a complete remake of the critically-acclaimed The Enemy Within campaign for the A-10C Warthog.

This story-driven campaign puts you in cockpit of the Warthog as part of a small, 6-ship US detachment sent to Georgia. Your mission is to help contain a growing threat from a terrorist organization calling itself the "Caucasus Liberation Army" (CLA). As the story unfolds, you will be faced with a variety of challenges, including close air support, precision strikes, combat search and rescue, anti-ship strikes, and even air to air combat.

Striving to be as realistic as possible, the units featured in the campaign are based on their real-life counterparts. It also uses a sophisticated radio control system, meaning that you must tune your on-board radios to the correct frequency to hear the more than 2000 custom voiceovers available throughout 21 missions.

Compared to the original campaign, version 3.0 offers following great additions and changes:

• 20 out of 21 missions have been rewritten from scratch. This includes the course of action, dialogues, briefings and background information.

• More than 2/3 of the missions take place in different locations than the original ones, and most feature different challenges and enemies to provide a completely new experience, 3 entirely new missions that are designed to complement and extend the storyline.

• The 8 pilot and 3 commander characters featured throughout the campaign have almost 4x more custom voiceovers (over 2100).

• Additional documents and custom kneeboard pages are available for each sortie.

Link: https://www.digitalcombatsimulator.com/en/shop/campaigns/the_enemy_within_3_campaign/

Cost: $9.99 USD

Author: Baltic Dragon

Requirements:

• A-10C / A-10CII

Community Notes

This is a hard campaign.  You'll make use of the CDU and comms.  This is easier than Operation Persian Freedom.

Iron Flag is a training campaign for the A-10C II Tank Killer module. The goal of Iron Flag is to expand on the training missions that come with it and teach you new things not found there. Also, go more in-depth on some of the things that are included with the module and explain some of the tactics and rationale behind employing the A-10 C, its systems, and weapons so that you and your Hog emerge more lethal!

Baltic Dragon and Nicholas Barnwell, authors of the campaign, tried to make Iron Flag as realistic as possible, given the limitations within DCS and their knowledge. They have leaned on real civilian and USAF pilots, including a few A-10 drivers, other subject matter experts, and many within the DCS community to help them bring you the definitive A-10 training experience.

Iron Flag Part 1 is split into 10 Training missions that focus heavily on many of the systems used for flight, navigation, and emergencies, including CDU functionality and usage, TACAN navigation, ILS landing, emergency flight control (MRFCS) usage, TAD/SADL functionality, and everyone's favorite: Aerial Refueling.

Part 1 of the campaign also introduces you to effective employment of the A-10C and its weapons, with missions focusing on DSMS and CMSP systems, TGP usage/functionality, Air-to-Air application of the gun, and AIM-9M and of course using the GAU-8/A in its intended Air-to-Ground role! The combat employment will be covered in more depth in the second part of the campaign.

The campaign features:

• 10 fully voiced-over missions

• Almost 3800 voiceovers (totaling nearly 9 hours of audio)

• Custom made maps, briefings, and kneeboards that will help you immerse into the missions and follow the training

Link: https://www.digitalcombatsimulator.com/en/shop/campaigns/a-10c_iron_flag_part_i_campaign/

Cost: $10.99 USD

Author: Baltic Dragon

Requirements:

• A-10CII

• Nevada Test and Training Range Map

Community Notes

Very realistic training, it takes you through all the buttons and menu options including items that you likely will not need to play the game.  This is great for a thorough understanding of the plane.

Not the quickest way to learn the plane due to how in-depth it goes into all the systems.

This focuses on the systems, communications and navigation.  There are a few tips about combat but its expected that the combat oriented training is part of the second half of this campaign that is not out yet.

This uses the Nevada Test and  Training Range Map which is only really used for training missions and is fairly expensive ($50 "USD.)