[FG28_Kodiak]

@Ataros

        switch (RandomIncident.Next(1,4))
        {
            case 1:
                GamePlay.gpPostMissionLoad("missions/Multi/Dogfight/BoF1/BoF1_air01.mis");
                GamePlay.gpHUDLogCenter("mission 1 objectives loaded...");

                double initTime = 0.0;
                Timeout(initTime += 600, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Enemy activity is expected at E3!");
                });
                Timeout(initTime += 600, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Help is needed at E3/D4!");
                });
            break;
            case 2:
                GamePlay.gpPostMissionLoad("missions/Multi/Dogfight/BoF1/BoF1_sea01.mis");
                GamePlay.gpHUDLogCenter("mission 2 objectives loaded..."); 

                double initTime = 0.0;
                Timeout(initTime += 500, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Cover your shipping at C4!");
                });
            
                Timeout(initTime += 300, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Ships are under attack at C4!");
                });
            break;
            case 3:
                GamePlay.gpPostMissionLoad("missions/Multi/Dogfight/BoF1/BoF1_air02.mis");
                GamePlay.gpHUDLogCenter("mission 3 objectives loaded...");

                double initTime = 0.0;
                Timeout(initTime += 600, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Enemy activity is expected at E2!");
                });
                Timeout(initTime += 300, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! All airgroups please proceed to E2/D3!");
                });
            break;

Made the declaration double initTime = 0.0 before the switch case and only onetimes. Then your script should work.

It should look like:

public override void OnTickGame()
{

   double initTime;    

    if (Time.tickCounter() % 1800 == 1000) // 54000=30 min repeat. 12600=7 min delay. 
  {
        // randomly selects 1 of several submissions

        Random RandomIncident = new Random();
        
        switch (RandomIncident.Next(1,4))
        {
            case 1:
                GamePlay.gpPostMissionLoad("missions/Multi/Dogfight/BoF1/BoF1_air01.mis");
                GamePlay.gpHUDLogCenter("mission 1 objectives loaded...");

               initTime = 0.0;
                Timeout(initTime += 600, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Enemy activity is expected at E3!");
                });
                Timeout(initTime += 600, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Help is needed at E3/D4!");
                });
            break;
            case 2:
                GamePlay.gpPostMissionLoad("missions/Multi/Dogfight/BoF1/BoF1_sea01.mis");
                GamePlay.gpHUDLogCenter("mission 2 objectives loaded..."); 

               initTime = 0.0;
                Timeout(initTime += 500, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Cover your shipping at C4!");
                });
            
                Timeout(initTime += 300, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Ships are under attack at C4!");
                });
            break;
            case 3:
                GamePlay.gpPostMissionLoad("missions/Multi/Dogfight/BoF1/BoF1_air02.mis");
                GamePlay.gpHUDLogCenter("mission 3 objectives loaded...");

                initTime = 0.0;
                Timeout(initTime += 600, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! Enemy activity is expected at E2!");
                });
                Timeout(initTime += 300, () =>
                {
                    GamePlay.gpHUDLogCenter("Attention! All airgroups please proceed to E2/D3!");
                });
            break;
        }
    }