diff --git a/game/data/doctrine.py b/game/data/doctrine.py
index 16227c29..1b421c16 100644
--- a/game/data/doctrine.py
+++ b/game/data/doctrine.py
@@ -105,9 +105,9 @@ MODERN_DOCTRINE = Doctrine(
     min_ingress_distance=nautical_miles(10),
     min_patrol_altitude=feet(15000),
     max_patrol_altitude=feet(33000),
-    min_cruise_altitude=feet(20000),
+    min_cruise_altitude=feet(10000),
     max_cruise_altitude=feet(40000),
-    min_combat_altitude=feet(15000),
+    min_combat_altitude=feet(1000),
     max_combat_altitude=feet(35000),
     cap_duration=timedelta(minutes=30),
     cap_min_track_length=nautical_miles(15),
@@ -149,9 +149,9 @@ COLDWAR_DOCTRINE = Doctrine(
     min_ingress_distance=nautical_miles(10),
     min_patrol_altitude=feet(10000),
     max_patrol_altitude=feet(24000),
-    min_cruise_altitude=feet(20000),
+    min_cruise_altitude=feet(10000),
     max_cruise_altitude=feet(30000),
-    min_combat_altitude=feet(5000),
+    min_combat_altitude=feet(1000),
     max_combat_altitude=feet(25000),
     cap_duration=timedelta(minutes=30),
     cap_min_track_length=nautical_miles(12),
@@ -195,7 +195,7 @@ WWII_DOCTRINE = Doctrine(
     max_patrol_altitude=feet(15000),
     min_cruise_altitude=feet(5000),
     max_cruise_altitude=feet(30000),
-    min_combat_altitude=feet(3000),
+    min_combat_altitude=feet(1000),
     max_combat_altitude=feet(10000),
     cap_duration=timedelta(minutes=30),
     cap_min_track_length=nautical_miles(8),