FOR THIS POLL, PLEASE ANSWER HOW YOU CHOOSE TO PLAY THE GAME, NOT NECESSARILY WHAT THE RULES AS WRITTEN (RAW) SAY.
The Deep Strike rules on page 84 of the rulebook say: "Roll for arrival of these units as specified in the Reserves rules and then deploy them as follows. . ."
The Drop Pod Assualt rules on page 21 of the Space Marine codex say: "Such units remain in reserve and arrive by drop pod, even if the Mission being played does not normally allow Reserves or Deep Strike."
The Daemon Summoning rules on page 12 of the Chaos codex say: "The Daemon units will start in reserve irrespective of whether the Reserves special rule is used in the mission being played. Starting with the second game turn roll a D6 for each Daemonic unit at the start of the Chaos turn. If you roll equal to or greater than the number shown, the unit becomes available. Turn 2 (4+), Turn 3 (3+), Turn 4+ (2+). When a Daemon unit becomes available place the large Ordnance blast marker in contact with a model carrying a Chaos Icon. . .The Daemons are then deployed on the area covered by the marker."
The Reserves rule on page 84 of the rulebook says: "Units in reserve are not deployed at the start of the battle, but will become available in later turns. Each selection from the Force Organization chart is diced for separately at the start of the players turn. Reserve unit arrives on: Turn 1 (N/A), Turn 2 (4+), Turn 3 (3+), Turn 4+ (2+). When a reserve unit arrives it must move on as specified in the Reserves section of the mission description."
And: "Note: You must roll for reserves as soon as possible and must bring them onto the table as soon as they are available. You may not delay making the dice rolls or keep the reserves hanging around off-table until you decide you need them!"
QUESTION: How do you play the timing of the Deep Strike/Drop Pod/Daemon Summoning Reserve rolls at the start of the turn and the subsequent deployment of Deep Striking/Drop Podding/Summoned units (especially in relation to Reserve units arriving normally onto the table)?
OPTION A. At the start of the turn I roll for one Deep Striking/Drop Podding/Summoned unit in Reserve and, if it successfully arrives, I immediately deploy it onto the table. I then repeat this process for all Deep Striking/Drop Podding/Summoned units in Reserve. All Deep Striking/Drop Podding/Summoned units must be rolled for (and deployed) before rolling for any Reserves units arriving normally onto the table. All Deep Strike/Drop Pod/Summoning deployment and normal Reserves movement must be completed before any units that started the turn on the table are allowed to move.
OPTION B. At the start of the turn I roll for one unit in Reserve and, if it successfully arrives, I immediately deploy/move it onto the table (whether it be via Deep Strike/Drop Pod/Summoning or normal Reserves movement onto the table). I then repeat this process for all units in Reserve. I can choose to roll for any unit in reserve in any order I wish; there is no need to roll for Deep Striking/Drop Podding/Summoned units before any Reserves units arriving normally onto the table. However, all Deep Strike/Drop Pod/Summoning deployment and normal Reserves movement must be completed before any units that started the turn on the table are allowed to move.
OPTION C. At the start of the turn I make Reserves rolls for all Deep Striking/Drop Podding/Summoned units in Reserve. I then deploy all Deep Striking/Drop Podding/Summoned units onto the table. After I have finished deploying all Deep Striking/Drop Podding/Summoned units, I roll for all the rest of my Reserve units arriving normally to the table. Any units that successfully arrive are moved onto the table before any units that started the turn on the table are allowed to move.
OPTION D. At the start of the turn I make Reserves rolls for all units in Reserve (whether they be arriving via Deep Strike/Drop Pod/Summoning or normally). I then deploy all Deep Striking/Drop Podding/Summoned units onto the table first. After I have finished deploying all Deep Striking/Drop Podding/Summoned units, I move the rest of my Reserve units arriving normally onto the table. Any units that successfully arrive are moved onto the table before any units that started the turn on the table are allowed to move.
OPTION E. At the start of the turn I make Reserves rolls for all units in Reserve (whether they be arriving via Deep Strike/Drop Pod/Summoning or normally). I then deploy all Deep Striking/Drop Podding units onto the table first. After I have finished deploying all Deep Striking/Drop Podding/Summoned units, I may then move the units that successfully arrived onto the table at any point during the movement phase, not necessarily before moving units that started the turn on the table.
OPTION F. At the start of the turn I make Reserves rolls for all units in Reserve (whether they be arriving via Deep Strike/Drop Pod/Summoning or normally). I may then choose to deploy Deep Striking/Drop Podding/Summoned units onto the table or move normally arriving Reserve units onto the table at any point during the movement phase, not necessarily before moving units that started the turn on the table.
OPTION G. Something else entirely: reply exactly what it is below.