diff --git a/game/db.py b/game/db.py
index 17648057..7253d4d2 100644
--- a/game/db.py
+++ b/game/db.py
@@ -39,10 +39,10 @@ PRICES = {
     # fighter
     C_101CC: 8,
     MiG_23MLD: 18,
-    Su_27: 24,
-    Su_33: 25,
-    MiG_29A: 24,
-    MiG_29S: 26,
+    Su_27: 20,
+    Su_33: 22,
+    MiG_29A: 23,
+    MiG_29S: 25,
 
     F_5E_3: 6,
     MiG_15bis: 5,
@@ -52,7 +52,7 @@ PRICES = {
     AV8BNA: 13,
     M_2000C: 13,
     FA_18C_hornet: 18,
-    F_15C: 24,
+    F_15C: 20,
 
     # bomber
     Su_25: 15,
diff --git a/game/event/insurgentattack.py b/game/event/insurgentattack.py
index 5a5d3f0a..a04d2168 100644
--- a/game/event/insurgentattack.py
+++ b/game/event/insurgentattack.py
@@ -15,6 +15,7 @@ class InsurgentAttackEvent(Event):
     SUCCESS_FACTOR = 0.7
     TARGET_VARIETY = 2
     TARGET_AMOUNT_FACTOR = 0.5
+    STRENGTH_INFLUENCE = 0.1
 
     @property
     def threat_description(self):
@@ -31,6 +32,9 @@ class InsurgentAttackEvent(Event):
     def __str__(self):
         return "Destroy insurgents"
 
+    def skip(self):
+        self.to_cp.base.affect_strength(-self.STRENGTH_INFLUENCE)
+
     def is_successfull(self, debriefing: Debriefing):
         killed_units = sum([v for k, v in debriefing.destroyed_units[self.attacker_name].items() if db.unit_task(k) == PinpointStrike])
         all_units = sum(self.targets.values())
diff --git a/game/game.py b/game/game.py
index 7de3101d..3215202f 100644
--- a/game/game.py
+++ b/game/game.py
@@ -58,14 +58,14 @@ EVENT_PROBABILITIES = {
     InfantryTransportEvent: [25, 0],
 
     # events conditionally present; for both enemy and player
-    BaseAttackEvent: [100, 8],
+    BaseAttackEvent: [100, 9],
 
     # events randomly present; for both enemy and player
-    InterceptEvent: [25, 8],
-    NavalInterceptEvent: [25, 8],
+    InterceptEvent: [25, 9],
+    NavalInterceptEvent: [25, 9],
 
     # events randomly present; only for the enemy
-    InsurgentAttackEvent: [0, 5],
+    InsurgentAttackEvent: [0, 6],
 }
 
 # amount of strength player bases recover for the turn
diff --git a/game/operation/intercept.py b/game/operation/intercept.py
index 27dabcda..b1ad1ee2 100644
--- a/game/operation/intercept.py
+++ b/game/operation/intercept.py
@@ -39,7 +39,7 @@ class InterceptOperation(Operation):
                         conflict=conflict)
 
     def generate(self):
-        self.prepare_carriers(self.interceptors.keys())
+        self.prepare_carriers(db.unitdict_from(self.interceptors))
 
         self.airgen.generate_transport(self.transport, self.to_cp.at)
         self.airgen.generate_defenders_escort(*assigned_units_split(self.escort), at=self.defenders_starting_position)
diff --git a/game/operation/operation.py b/game/operation/operation.py
index 19ff9611..2631da4e 100644
--- a/game/operation/operation.py
+++ b/game/operation/operation.py
@@ -88,7 +88,7 @@ class Operation:
             if not global_cp.is_global:
                 continue
 
-            ship = self.shipgen.generate_carrier(for_units=for_units,
+            ship = self.shipgen.generate_carrier(for_units=[t for t, c in for_units.items() if c > 0],
                                                  country=self.game.player,
                                                  at=global_cp.at)
 
diff --git a/gen/heli.py b/gen/heli.py
deleted file mode 100644
index dc4968c5..00000000
--- a/gen/heli.py
+++ /dev/null
@@ -1,5 +0,0 @@
-from .aircraft import *
-
-
-class HelicopterConflictGenerator(AircraftConflictGenerator):
-    pass
diff --git a/gen/shipgen.py b/gen/shipgen.py
index bdff7234..47808961 100644
--- a/gen/shipgen.py
+++ b/gen/shipgen.py
@@ -16,13 +16,9 @@ class ShipGenerator:
         self.m = mission
         self.conflict = conflict
 
-    def generate_carrier(self, for_units: db.UnitsDict, country: str, at: Point) -> ShipGroup:
+    def generate_carrier(self, for_units: typing.Collection[UnitType], country: str, at: Point) -> ShipGroup:
         type = db.find_unittype(Carriage, country)[0]
-        print(for_units)
-        for unit_type, unit_count in for_units.items():
-            if unit_count == 0:
-                continue
-
+        for unit_type in for_units:
             if unit_type in db.CARRIER_TYPE_BY_PLANE:
                 type = db.CARRIER_TYPE_BY_PLANE[unit_type]
                 break