diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4662e482..714ec301 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ will consitute of a breaking change warranting a new major release:
 
 ## Changed
 
+- STR quaternions are now used by the `MEKF` by default
+- Changed nominal `SUS Assembly` side to `B Side`.
 - Changed source for state machine of detumbling to SUS and MGM only.
 - Changed `FusedRotRateData` dataset to always display rotation rate from SUS and MGM.
 
diff --git a/mission/controller/acs/AcsParameters.h b/mission/controller/acs/AcsParameters.h
index 4ed80e83..eab708e5 100644
--- a/mission/controller/acs/AcsParameters.h
+++ b/mission/controller/acs/AcsParameters.h
@@ -949,7 +949,7 @@ class AcsParameters : public HasParametersIF {
     double sensorNoiseGyrArw = 3. * 0.0043 / sqrt(10) * DEG2RAD;  // Angular Random Walk
     double sensorNoiseGyrBs = 3. / 3600. * DEG2RAD;               // Bias Stability
 
-    uint8_t allowStr = false;
+    uint8_t allowStr = true;
   } kalmanFilterParameters;
 
   struct MagnetorquerParameter {
diff --git a/mission/system/acs/acsModeTree.cpp b/mission/system/acs/acsModeTree.cpp
index 018418a4..9751dffa 100644
--- a/mission/system/acs/acsModeTree.cpp
+++ b/mission/system/acs/acsModeTree.cpp
@@ -105,7 +105,7 @@ Subsystem& satsystem::acs::init() {
   };
   // Build TARGET PT transition 0
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_PTG_TRANS_0.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_PTG_TRANS_0.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TRANS_0.second, true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TRANS_0.second, true);
   iht(objects::RW_ASSY, NML, 0, ACS_TABLE_PTG_TRANS_0.second);
   iht(objects::STR_ASSY, NML, 0, ACS_TABLE_PTG_TRANS_0.second);
@@ -114,7 +114,7 @@ Subsystem& satsystem::acs::init() {
         ctxc);
 
   // Build SUS board transition
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, SUS_BOARD_NML_TRANS.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, SUS_BOARD_NML_TRANS.second, true);
   check(ACS_SUBSYSTEM.addTable(TableEntry(SUS_BOARD_NML_TRANS.first, &SUS_BOARD_NML_TRANS.second)),
         ctxc);
 
@@ -200,14 +200,14 @@ void buildSafeSequence(Subsystem& ss, ModeListEntry& eh) {
   iht(objects::ACS_CONTROLLER, acs::AcsMode::SAFE, acs::SafeSubmode::DEFAULT,
       ACS_TABLE_SAFE_TGT.second, true);
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_SAFE_TGT.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_SAFE_TGT.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_SAFE_TGT.second, true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_SAFE_TGT.second, true);
   check(ss.addTable(&ACS_TABLE_SAFE_TGT.second, ACS_TABLE_SAFE_TGT.first, false, true), ctxc);
 
   // Build SAFE transition 0
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_SAFE_TRANS_0.second);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_SAFE_TRANS_0.second, true);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_SAFE_TRANS_0.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_SAFE_TRANS_0.second, true);
   iht(objects::STR_ASSY, OFF, 0, ACS_TABLE_SAFE_TRANS_0.second);
   iht(objects::RW_ASSY, OFF, 0, ACS_TABLE_SAFE_TRANS_0.second);
   check(ss.addTable(&ACS_TABLE_SAFE_TRANS_0.second, ACS_TABLE_SAFE_TRANS_0.first, false, true),
@@ -257,14 +257,14 @@ void buildIdleSequence(Subsystem& ss, ModeListEntry& eh) {
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_IDLE_TGT.second);
   iht(objects::RW_ASSY, NML, 0, ACS_TABLE_IDLE_TGT.second);
   iht(objects::STR_ASSY, NML, 0, ACS_TABLE_IDLE_TGT.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_IDLE_TGT.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_IDLE_TGT.second, true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_IDLE_TGT.second, true);
   ss.addTable(&ACS_TABLE_IDLE_TGT.second, ACS_TABLE_IDLE_TGT.first, false, true);
 
   // Build IDLE transition 0
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_IDLE_TRANS_0.second);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_IDLE_TRANS_0.second, true);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_IDLE_TRANS_0.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_IDLE_TRANS_0.second, true);
   iht(objects::RW_ASSY, NML, 0, ACS_TABLE_IDLE_TRANS_0.second);
   iht(objects::STR_ASSY, NML, 0, ACS_TABLE_IDLE_TRANS_0.second);
   ss.addTable(&ACS_TABLE_IDLE_TRANS_0.second, ACS_TABLE_IDLE_TRANS_0.first, false, true);
@@ -307,7 +307,7 @@ void buildTargetPtSequence(Subsystem& ss, ModeListEntry& eh) {
   // Build TARGET PT table
   iht(objects::ACS_CONTROLLER, acs::AcsMode::PTG_TARGET, 0, ACS_TABLE_PTG_TARGET_TGT.second);
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_TGT.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_PTG_TARGET_TGT.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_TGT.second, true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_TGT.second, true);
   iht(objects::RW_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_TGT.second);
   iht(objects::STR_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_TGT.second);
@@ -356,7 +356,7 @@ void buildTargetPtNadirSequence(Subsystem& ss, ModeListEntry& eh) {
   // Build TARGET PT table
   iht(objects::ACS_CONTROLLER, acs::AcsMode::PTG_NADIR, 0, ACS_TABLE_PTG_TARGET_NADIR_TGT.second);
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_NADIR_TGT.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_PTG_TARGET_NADIR_TGT.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_NADIR_TGT.second, true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_NADIR_TGT.second, true);
   iht(objects::RW_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_NADIR_TGT.second);
   iht(objects::STR_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_NADIR_TGT.second);
@@ -409,7 +409,7 @@ void buildTargetPtGsSequence(Subsystem& ss, ModeListEntry& eh) {
   // Build TARGET PT table
   iht(objects::ACS_CONTROLLER, acs::AcsMode::PTG_TARGET_GS, 0, ACS_TABLE_PTG_TARGET_GS_TGT.second);
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_GS_TGT.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_PTG_TARGET_GS_TGT.second, true);
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_GS_TGT.second, true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_GS_TGT.second, true);
   iht(objects::RW_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_GS_TGT.second);
   iht(objects::STR_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_GS_TGT.second);
@@ -462,7 +462,7 @@ void buildTargetPtInertialSequence(Subsystem& ss, ModeListEntry& eh) {
   iht(objects::ACS_CONTROLLER, acs::AcsMode::PTG_INERTIAL, 0,
       ACS_TABLE_PTG_TARGET_INERTIAL_TGT.second);
   iht(objects::IMTQ_ASSY, NML, 0, ACS_TABLE_PTG_TARGET_INERTIAL_TGT.second);
-  iht(objects::SUS_BOARD_ASS, NML, duallane::A_SIDE, ACS_TABLE_PTG_TARGET_INERTIAL_TGT.second,
+  iht(objects::SUS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_INERTIAL_TGT.second,
       true);
   iht(objects::ACS_BOARD_ASS, NML, duallane::B_SIDE, ACS_TABLE_PTG_TARGET_INERTIAL_TGT.second,
       true);