diff --git a/Descent3/BriefingParse.cpp b/Descent3/BriefingParse.cpp
index d356d0c06..014191b91 100644
--- a/Descent3/BriefingParse.cpp
+++ b/Descent3/BriefingParse.cpp
@@ -74,24 +74,7 @@
 #include "voice.h"
 
 //	constructor
-CBriefParse::CBriefParse() {
-  AddTextEffect = NULL;
-  AddBmpEffect = NULL;
-  AddMovieEffect = NULL;
-  AddBkgEffect = NULL;
-  AddPolyEffect = NULL;
-  AddSoundEffect = NULL;
-  AddButtonEffect = NULL;
-  StartScreen = NULL;
-  EndScreen = NULL;
-  LoopCallback = NULL;
-  SetTitle = NULL;
-  SetStatic = NULL;
-  SetGlitch = NULL;
-  AddVoice = NULL;
-  linenum = 0;
-  parse_error = false;
-}
+CBriefParse::CBriefParse() {}
 
 //	destructor
 CBriefParse::~CBriefParse() {}
diff --git a/Descent3/BriefingParse.h b/Descent3/BriefingParse.h
index 5eae21c1b..b50ccce32 100644
--- a/Descent3/BriefingParse.h
+++ b/Descent3/BriefingParse.h
@@ -91,20 +91,20 @@ class CBriefParse {
   int ParseBriefing(const char *filename);
 
 private:
-  void (*AddTextEffect)(TCTEXTDESC* desc, char *text, char *description, int id);
-  void (*AddBmpEffect)(TCBMPDESC* desc, char *description);
-  void (*AddMovieEffect)(TCMOVIEDESC* desc, char *description);
-  void (*AddBkgEffect)(TCBKGDESC* desc, char *description);
-  void (*AddPolyEffect)(TCPOLYDESC* desc, char *description);
-  void (*AddSoundEffect)(TCSNDDESC* desc, char *description);
-  void (*AddButtonEffect)(TCBUTTONDESC* desc, char *description, int id);
-  void (*StartScreen)(int screen_num, char *desc, char *layout, uint32_t mask_set, uint32_t mask_unset);
-  void (*EndScreen)();
-  bool (*LoopCallback)();
-  void (*SetTitle)(char *title);
-  void (*SetStatic)(float amount);
-  void (*SetGlitch)(float amount);
-  void (*AddVoice)(char *filename, int flags, char *description);
+  void (*AddTextEffect)(TCTEXTDESC* desc, char *text, char *description, int id) = nullptr;
+  void (*AddBmpEffect)(TCBMPDESC* desc, char *description) = nullptr;
+  void (*AddMovieEffect)(TCMOVIEDESC* desc, char *description) = nullptr;
+  void (*AddBkgEffect)(TCBKGDESC* desc, char *description) = nullptr;
+  void (*AddPolyEffect)(TCPOLYDESC* desc, char *description) = nullptr;
+  void (*AddSoundEffect)(TCSNDDESC* desc, char *description) = nullptr;
+  void (*AddButtonEffect)(TCBUTTONDESC* desc, char *description, int id) = nullptr;
+  void (*StartScreen)(int screen_num, char *desc, char *layout, uint32_t mask_set, uint32_t mask_unset) = nullptr;
+  void (*EndScreen)() = nullptr;
+  bool (*LoopCallback)() = nullptr;
+  void (*SetTitle)(char *title) = nullptr;
+  void (*SetStatic)(float amount) = nullptr;
+  void (*SetGlitch)(float amount) = nullptr;
+  void (*AddVoice)(char *filename, int flags, char *description) = nullptr;
 
   void ParseError(const char *msg, const char *p = NULL);
   const char *ParseComma(const char *p);
@@ -117,8 +117,8 @@ class CBriefParse {
   bool ParseButtonEffect(const char *p);
   bool ParseTextEffect(const char *p, tTextBufferDesc *tbd);
 
-  int linenum;
-  bool parse_error;
+  int linenum = 0;
+  bool parse_error = false;
 };
 
 #endif
diff --git a/Descent3/hud.h b/Descent3/hud.h
index 3b94ea4b1..a501f1592 100644
--- a/Descent3/hud.h
+++ b/Descent3/hud.h
@@ -652,14 +652,14 @@ struct tMsgList {
 //////////////////////////////////////////////////////////////////////////////
 
 class MsgListConsole {
-  tMsgList *m_list;
+  tMsgList *m_list = nullptr;
   int m_x, m_y, m_w, m_h;
-  int m_bufline, m_buflen, m_curmsgs, m_numlines;
-  bool m_opened;
-  char *m_buffer;
+  int m_bufline = 0, m_buflen, m_curmsgs, m_numlines;
+  bool m_opened = false;
+  char *m_buffer = nullptr;
   char m_title[32];
-  char **m_conlines;
-  int n_conlines;
+  char **m_conlines = nullptr;
+  int n_conlines = 0;
   int m_keydownstate; // -1 for up key, 1 for down key, 0 for none.
   float m_keydowntime;
 
diff --git a/Descent3/hudmessage.cpp b/Descent3/hudmessage.cpp
index d5f83b6b5..5fcaee6f0 100644
--- a/Descent3/hudmessage.cpp
+++ b/Descent3/hudmessage.cpp
@@ -1604,14 +1604,7 @@ const char *tMsgList::get(int i) {
 
 //////////////////////////////////////////////////////////////////////////////
 
-MsgListConsole::MsgListConsole() {
-  m_opened = false;
-  m_list = NULL;
-  m_buffer = NULL;
-  m_bufline = 0;
-  m_conlines = NULL;
-  n_conlines = 0;
-}
+MsgListConsole::MsgListConsole() {}
 
 MsgListConsole::~MsgListConsole() {}
 
diff --git a/Descent3/mmItem.h b/Descent3/mmItem.h
index 2605c6a16..bee7ebafb 100644
--- a/Descent3/mmItem.h
+++ b/Descent3/mmItem.h
@@ -112,10 +112,10 @@ void MenuScene(); // display menu scene
 class tmmItemQueue {
 #define tmmItemSIZE 8
   tmmItemFX m_items[tmmItemSIZE];
-  int16_t m_head, m_tail;
+  int16_t m_head = 0, m_tail = 0;
 
 public:
-  tmmItemQueue() { m_head = m_tail = 0; };
+  tmmItemQueue() {};
   ~tmmItemQueue(){};
   void send(tmmItemFX &item) { // sends an item onto the queue
     int16_t temp = m_tail + 1;
diff --git a/Descent3/pilot.cpp b/Descent3/pilot.cpp
index 97ec42fea..039a1a2a4 100644
--- a/Descent3/pilot.cpp
+++ b/Descent3/pilot.cpp
@@ -1821,11 +1821,11 @@ class UIBmpWindow final : public UIStatic {
 
 private:
   void DrawBorder();
-  bool animated;
-  int bm_handle;
+  bool animated = false;
+  int bm_handle = -1;
   float start_time;
   UIText text;
-  bool created;
+  bool created = false;
 };
 
 //	struct ship_pos
@@ -2957,10 +2957,7 @@ void UI3DWindow::OnDraw() {
 }
 
 UIBmpWindow::UIBmpWindow() {
-  animated = false;
-  bm_handle = -1;
   start_time = timer_GetTime();
-  created = false;
 }
 
 UIBmpWindow::~UIBmpWindow() {}
diff --git a/lib/application.h b/lib/application.h
index 85a7c0586..acd5fe486 100644
--- a/lib/application.h
+++ b/lib/application.h
@@ -81,10 +81,10 @@ const int OEAPP_WINDOWED = 1, // App will run in a window. May not be supported.
     OEAPP_CONSOLE = 8;        // App will run in a console style window.
 class oeApplication {
 protected:
-  bool m_AppActive;
+  bool m_AppActive = true;
 
 public:
-  oeApplication() { m_AppActive = true; };
+  oeApplication() {};
   virtual ~oeApplication(){};
   //	initializes the object
   virtual void init() = 0;
diff --git a/lib/psclass.h b/lib/psclass.h
index a472775aa..90544894a 100644
--- a/lib/psclass.h
+++ b/lib/psclass.h
@@ -152,10 +152,10 @@ template <class T> class tList {
 
 template <class T, int t_LEN> class tQueue {
   T m_items[t_LEN];
-  int16_t m_head, m_tail;
+  int16_t m_head = 0, m_tail = 0;
 
 public:
-  tQueue() { m_head = m_tail = 0; };
+  tQueue() {};
   ~tQueue(){};
 
   void send(T &item) { // sends an item onto the queue