Alright as Misty and ZAB1019 are asking the same questions, I shall answer them both together.
1: A jtac spotter lazes in an OB saying it will kill a lot of t3s and maybe even queen. You assume this due to queen being where most of the t3s are. You aim and press fire but the coords are being blocked. Turned out the coord is directly ontop of a new hive core. The coords are LAT 240, LONG 210. There is an area north of the hive core which is unprotected. Maybe 12 tiles. There are marines south, but half a dozen will be severely hurt from OB. The hive core just got destroyed. What do you do?
Answer : I would hold the OB. Given that even with helmet cams one in CIC will not have a perfect picture of groundside. I will contact the Jtac spotter to request new coords and if there is a lack of time, order the marines to pull back south and ensure they are doing so before pressing fire. 6 marines can very easily lead a semi-unstable front to collapse especially if the Xenos know exactly what they are doing and sense that your line has been weakened while medics are desperately trying to revive marines. Men are a resource not to be squandered carelessly.
2: Alpha squad has no SL. It has 12 ungas in it. You assign an aSL. Charlie Squad has 8, but an SL who seems sane. Charlie SL asks for a command headset to lead alpha squad and perhaps others. What do? Do you alter orders to keep those two squads together or do you deny? Why?
Answer: It depends on the situation. Sometimes the front requires more flexibilities. For example, 8 good marines can hold a flank in a prepared position. However, I will still grant Charlie SL a command headset as like you said, he seems sane. So the addition of a command headset will only be an advantage to the man, as now he gets access to a broader range of comm channels, integrating him further into the marine battlenet and thus allowing him to react faster to the battlefield while becoming somewhat semi-autonomous by taking his own initative.
3: A xeno boards the transport. There is not a single person on the transport. You saw it just as the transport's auto run launches it from FOB. What do you do?
Answer : Immediately open the shipside armory informing the crew on board the exact number of Xenos (In this case, one), type or caste and if possible, sub castes. ARES should automatically set Red but depending on if the game bugs out (Happened once recently when the DP launched the Alamo after a Queen snuck aboard (FOB Held) but ARES stayed on blue regardless.) set to red if need be. Depending on who is running the Op, I send any excess CIC Crew to assist if need be, such as one or two SOs, the XO if I'm in command, or myself if I late join and it's the XO running the Operation. I feel it is more important to send the SOs who arrived late as they have a lesser grasp of the situation and require time to settle in, same with an XO or CO who latejoins.
4: Its xeno hijack and the queen just crashed into the almayer. You, by chance, appear to be about 1 screen away. You have all your CO gear on you. What do you do?
Answer : Depends on the situation. If the Xenos rush in the opposite direction away from me, I sneak into the DS if it's empty to destroy the pool to aid the defending marines in their endeavors, be it holding for Evac or for a last stand (Highly unlikely as Xenos are human players too and will usually know better). If I have a horde of marines with me, I might attempt to push after a rough estimate of how many marines with me compared to Xeno numbers and terrain, focusing on the easiest Xenos to kill to lower the amount of Xenos in a fight or just do a fighting retreat till I have enough marines to stabilize the front and from there, go for kills. However, if I am alone, it's not going to help anyone for me to suicide by Xeno horde. So a tactical retreat might be the wisest option to regroup and reassess the situation. There's a time to fight, and there's a time to pull back if need be.
5: It's LV. You're slowly losing. You have a nice HE OB prepped and have been asking for coords for a while but no one gives it. The fighting is at containers/cave entrance in the north east. The marines just got pushed out of the caves and it's going to be a full retreat to hydro very soon. There aren't that many xenos left, but they're robust, queen is out and their carrier is frontline capping and putting marines in nests near the cave entrance. Those numbers will swing the balance heavily in xeno's favour. Hydro is properly caded, has no ammo and even fob has limited ammo. Hydro road isn't caded either. Nexus just barely is.
Answer: I will immediately request coords directly from a specific RTO which I feel isn't in immediate danger. However, if I get no replies, I will have the engineers focus on Nexus and Cargo and to work as fast as able with what they have while I attempt a fighting retreat to save as many marines and buy as much time. While having Alamo hold on the LZ. This way I cover my bases. If the marines rally and push the xenos back, freeing the captures, Great. The best outcome. Time is the most valuable commodity here. If the marines get pushed back into Hydro. I might take the risk of them having to retreat via Fitness and West Nexus back to FOB. However it is more likely I pull them back to the Hydro road corner attempting to buy time for the Engineers directly to the south working on Central Nexus and the main hallway. Alamo being on the LZ means that in the worst case scenario, the marines can evac and pull out as the situation requires.
6: Its big red, charlie squad has no SL but spec, sg and enough support to make it still functional. The orders you made are generic bravo fob and comms and all other squads to lambda. Alpha and delta go to lambda pods just fine, but charlie ignores it and goes through filt podlocks, c4ing in and flanking east lambda lab. It seems the hive is in NW lambda, or the actual lambda lab building itself. What do you do?
Answer : As most Xenos tend to meta hold filt, and I am presuming the fact that Charlie managed to breach through filt on their own means that they are pretty capable. That said. I would probably assign an SO to keep an eye on Charlie, while assigning the smaller of the other 2 squads, Alpha or Delta, to push South East into the caves to link up with Charlie in order to give them an exit route before having the Squad rejoin with the other marines at SW Lambda. This way. I get flexibility with Charlie who has an escape route to evac if they get pushed hard. While Alpha and Delta have the numbers to attempt a hold. This also leaves Charlie in a position to cut off any retreat if the Xenos try to run when Alpha and Delta breaks through or it leaves Charlie in a position to hammer into the Xeno flank.
Even if the inital scenario has the Xenos hive camp and Charlie runs into no resistance while breaching from Filt, I would have done the same thing. I believe in being like water, freezing solid to block any advance if the situation requires it, or pulling back to avoid being broken if the Xenos intends to force their way through, flowing around resistance like water.