diff --git a/eos/effects/subsystembonusamarrdefensiveinformationwarfare.py b/eos/effects/subsystembonusamarrdefensiveinformationwarfare.py
new file mode 100644
index 000000000..9d1222b0a
--- /dev/null
+++ b/eos/effects/subsystembonusamarrdefensiveinformationwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Amarr Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Information Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusAmarrDefensive") * level)
diff --git a/eos/effects/subsystembonusamarrdefensiveinformationwarfarehidden.py b/eos/effects/subsystembonusamarrdefensiveinformationwarfarehidden.py
new file mode 100644
index 000000000..58eae4069
--- /dev/null
+++ b/eos/effects/subsystembonusamarrdefensiveinformationwarfarehidden.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Amarr Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Information Warfare Specialist"),
+                                  "commandBonusHidden", module.getModifiedItemAttr("subsystemBonusAmarrDefensive") * level)
diff --git a/eos/effects/subsystembonusamarrdefensiveskirmishwarfare.py b/eos/effects/subsystembonusamarrdefensiveskirmishwarfare.py
new file mode 100644
index 000000000..b59796e34
--- /dev/null
+++ b/eos/effects/subsystembonusamarrdefensiveskirmishwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Amarr Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Skirmish Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusAmarrDefensive") * level)
diff --git a/eos/effects/subsystembonuscaldaridefensiveinformationwarfare.py b/eos/effects/subsystembonuscaldaridefensiveinformationwarfare.py
new file mode 100644
index 000000000..5182a60b7
--- /dev/null
+++ b/eos/effects/subsystembonuscaldaridefensiveinformationwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Caldari Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Information Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusCaldariDefensive") * level)
diff --git a/eos/effects/subsystembonuscaldaridefensiveinformationwarfarehidden.py b/eos/effects/subsystembonuscaldaridefensiveinformationwarfarehidden.py
new file mode 100644
index 000000000..86fd0c8f2
--- /dev/null
+++ b/eos/effects/subsystembonuscaldaridefensiveinformationwarfarehidden.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Caldari Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Information Warfare Specialist"),
+                                  "commandBonusHidden", module.getModifiedItemAttr("subsystemBonusCaldariDefensive") * level)
diff --git a/eos/effects/subsystembonuscaldaridefensiveskirmishwarfare.py b/eos/effects/subsystembonuscaldaridefensiveskirmishwarfare.py
new file mode 100644
index 000000000..d46c2d764
--- /dev/null
+++ b/eos/effects/subsystembonuscaldaridefensiveskirmishwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Caldari Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Skirmish Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusCaldariDefensive") * level)
diff --git a/eos/effects/subsystembonusgallentedefensivearmoredwarfare.py b/eos/effects/subsystembonusgallentedefensivearmoredwarfare.py
new file mode 100644
index 000000000..af070d4e1
--- /dev/null
+++ b/eos/effects/subsystembonusgallentedefensivearmoredwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Gallente Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Armored Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusGallenteDefensive") * level)
diff --git a/eos/effects/subsystembonusgallentedefensiveskirmishwarfare.py b/eos/effects/subsystembonusgallentedefensiveskirmishwarfare.py
new file mode 100644
index 000000000..38efc1d7a
--- /dev/null
+++ b/eos/effects/subsystembonusgallentedefensiveskirmishwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Gallente Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Skirmish Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusGallenteDefensive") * level)
diff --git a/eos/effects/subsystembonusminmatardefensivearmoredwarfare.py b/eos/effects/subsystembonusminmatardefensivearmoredwarfare.py
new file mode 100644
index 000000000..bd720dfda
--- /dev/null
+++ b/eos/effects/subsystembonusminmatardefensivearmoredwarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Minmatar Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Armored Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusMinmatarDefensive") * level)
diff --git a/eos/effects/subsystembonusminmatardefensivesiegewarfare.py b/eos/effects/subsystembonusminmatardefensivesiegewarfare.py
new file mode 100644
index 000000000..b84e53718
--- /dev/null
+++ b/eos/effects/subsystembonusminmatardefensivesiegewarfare.py
@@ -0,0 +1,5 @@
+type = "passive"
+def handler(fit, module, context):
+    level = fit.character.getSkill("Minmatar Defensive Systems").level
+    fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Siege Warfare Specialist"),
+                                  "commandBonus", module.getModifiedItemAttr("subsystemBonusMinmatarDefensive") * level)