I will be playing Vanilla Yu Jing. So, I will be using them in my example. Q.1) What is the difference of having a Fireteam:<fill in the blank> listed on the profile card and (Fireteam:<fill in the blank<) listed under a troop profile? For example, Su-Jian has the "Fireteam:Duo" listed on the profile card (in the orange part). Where as the Zhanying Imp Agent has "(Fireteam: Harris, Sensor)" listed in the troop selection area. Q.2) Since the Su-Jian has Fireteam: Duo listed in the profile can I add any other unit to the Fireteam:Duo? or is it just another Su-Jian? Thanks!
1. Nothing, except which unit options have it. So if it's in the profile itself, all options get it, but when it's listed in an option only that option gets it. 2. All Fireteams apart from Triad and Enomotarchos require members from the same unit, unless the Sectorial chart says otherwise. So yes, a Su Jian can only for a Duo with another Su Jian.
For Vanilla Yu Jing, the Zhanying Imperial Agent with (Fireteam: Harris, Sensor) can be in a Fireteam: harris with two other Zhanying Imperial Agents, correct?
Vanilla factions can't run Fireteams other than Duo, and even that requires jumping through a lot of hoops. The exception is Tohaa, who are structured like a Sectorial anyway.
Also, the fireteam rules state that at least one unit in the fireteam must have the skill. That fireteam skill can be listed in either location to meet that requirement, correct?
I should ignore the Army build and only refer to the fireteam list then, huh? Because fireteams are listed for Vanilla in the army builder.
The Fireteam skills are listed, but to form a Fireteam you need permission from the Sectorial Army list, as well as the skill. For example, all CSUs have the Fireteam: Duo skill, but only StarCo and OS have permission to form CSU Duos. Army is the official source for profiles, but only has notes on Fireteam composition. The most up to date and Authorative listing of Fireteams is here: http://infinitythewiki.com/en/List_of_Fireteams
Correct. The most common example for this are Haris firteams. Usually only one troop option has the Haris rule. So you need to include that one + two others (any). Correct. Army is good for reference and once your print your list it will include the fireteam options for the troops on the list. But for the most accurate and complete fireteam options you should go to the firteams list in the wiki. http://infinitythewiki.com/en/List_of_Fireteams
Please note that TeamPro in vanilla armies do not give any permission to used special Fireteam compositions, which means that you need to refer to your Sectorial Army List with regards to which Fireteams are permissible. Since a vanilla sectorial have no Sectorial Army List, only the Common Requirements for Fireteams apply, where we read that "A Fireteam must be composed of troopers belonging to the same unit, or..." As such, Patsy in vanilla Pan-O can't form a Duo with Orcs because she does not belong to the same unit as the Orcs (she does not share Unit Profile with them), Su-Jian can't form a Duo in vanilla Yu Jing because they lack the required AVA. On the other hand, CSU in ISS or NCA can for the same reasons that normal Orcs or Suryats can in vanilla (provided at least one member has the skill) - because they belong to the same unit. http://infinitythewiki.com/en/Common_Requirements A Fireteam must be composed of troopers belonging to the same unit, or of those that the Sectorial Army List specifies are able to do so. Some special Fireteams can ignore this Requirement, as specified in their description or in the Sectorial Army List.
That's a different discussion https://forum.corvusbelli.com/threads/can-csus-run-duo-in-nca-army.25158/