diff --git a/code/modules/holodeck/HolodeckObjects.dm b/code/modules/holodeck/HolodeckObjects.dm
index a90ebdb8ce..7fcf97a410 100644
--- a/code/modules/holodeck/HolodeckObjects.dm
+++ b/code/modules/holodeck/HolodeckObjects.dm
@@ -137,7 +137,7 @@ datum/unarmed_attack/holopugilism/unarmed_override(var/mob/living/carbon/human/u
 	if(!damage)
 		playsound(target.loc, 'sound/weapons/punchmiss.ogg', 25, 1, -1)
 		target.visible_message("<font color='red'><B>[user] has attempted to punch [target]!</B></font>")
-		return 1
+		return TRUE
 	var/obj/item/organ/external/affecting = target.get_organ(ran_zone(user.zone_sel.selecting))
 	var/armor_block = target.run_armor_check(affecting, "melee")
 	var/armor_soak = target.get_armor_soak(affecting, "melee")
@@ -150,14 +150,14 @@ datum/unarmed_attack/holopugilism/unarmed_override(var/mob/living/carbon/human/u
 	target.visible_message("<font color='red'><B>[user] has punched [target]!</B></font>")
 
 	if(armor_soak >= damage)
-		return
+		return TRUE
 
 	target.apply_damage(damage, HALLOSS, affecting, armor_block, armor_soak)
 	if(damage >= 9)
 		target.visible_message("<font color='red'><B>[user] has weakened [target]!</B></font>")
 		target.apply_effect(4, WEAKEN, armor_block)
 
-	return 1
+	return TRUE
 
 /obj/structure/window/reinforced/holowindow/attackby(obj/item/W as obj, mob/user as mob)
 	if(!istype(W))
@@ -289,8 +289,8 @@ datum/unarmed_attack/holopugilism/unarmed_override(var/mob/living/carbon/human/u
 		spark_system.set_up(5, 0, user.loc)
 		spark_system.start()
 		playsound(user.loc, 'sound/weapons/blade1.ogg', 50, 1)
-		return 1
-	return 0
+		return TRUE
+	return FALSE
 
 /obj/item/weapon/holo/esword/New()
 	item_color = pick("red","blue","green","purple")
diff --git a/code/modules/mob/living/carbon/human/human_attackhand.dm b/code/modules/mob/living/carbon/human/human_attackhand.dm
index 38def474b3..3902b65420 100644
--- a/code/modules/mob/living/carbon/human/human_attackhand.dm
+++ b/code/modules/mob/living/carbon/human/human_attackhand.dm
@@ -40,11 +40,11 @@
 				H.do_attack_animation(src)
 				playsound(loc, 'sound/weapons/punchmiss.ogg', 25, 1, -1)
 				visible_message("<font color='red'><B>[H] reaches for [src], but misses!</B></font>")
-				return 0
+				return FALSE
 
 		if(H != src && check_shields(0, null, H, H.zone_sel.selecting, H.name))
 			H.do_attack_animation(src)
-			return 0
+			return FALSE
 
 	if(istype(M,/mob/living/carbon))
 		var/mob/living/carbon/C = M
@@ -88,7 +88,7 @@
 
 			else if(!(M == src && apply_pressure(M, M.zone_sel.selecting)))
 				help_shake_act(M)
-			return 1
+			return TRUE
 
 		if(I_GRAB)
 			if(M == src || anchored)
@@ -113,7 +113,7 @@
 			H.do_attack_animation(src)
 			playsound(loc, 'sound/weapons/thudswoosh.ogg', 50, 1, -1)
 			visible_message("<span class='warning'>[M] has grabbed [src] passively!</span>")
-			return 1
+			return TRUE
 
 		if(I_HURT)
 
@@ -139,7 +139,7 @@
 
 			if(!affecting || affecting.is_stump())
 				M << "<span class='danger'>They are missing that limb!</span>"
-				return 1
+				return TRUE
 
 			switch(src.a_intent)
 				if(I_HELP)
@@ -209,10 +209,10 @@
 			// See what attack they use
 			var/datum/unarmed_attack/attack = H.get_unarmed_attack(src, hit_zone)
 			if(!attack)
-				return 0
+				return FALSE
 
 			if(attack.unarmed_override(H, src, hit_zone))
-				return 0
+				return FALSE
 
 			H.do_attack_animation(src)
 			if(!attack_message)
@@ -225,7 +225,7 @@
 			add_attack_logs(H,src,"Melee attacked with fists (miss/block)")
 
 			if(miss_type)
-				return 0
+				return FALSE
 
 			var/real_damage = rand_damage
 			var/hit_dam_type = attack.damage_type
@@ -326,7 +326,7 @@
 	var/armor_soak = get_armor_soak(affecting, armor_type, armor_pen)
 	apply_damage(damage, BRUTE, affecting, armor_block, armor_soak, sharp = a_sharp, edge = a_edge)
 	updatehealth()
-	return 1
+	return TRUE
 
 //Used to attack a joint through grabbing
 /mob/living/carbon/human/proc/grab_joint(var/mob/living/user, var/def_zone)
@@ -337,43 +337,43 @@
 			break
 
 	if(!has_grab)
-		return 0
+		return FALSE
 
 	if(!def_zone) def_zone = user.zone_sel.selecting
 	var/target_zone = check_zone(def_zone)
 	if(!target_zone)
-		return 0
+		return FALSE
 	var/obj/item/organ/external/organ = get_organ(check_zone(target_zone))
 	if(!organ || organ.dislocated > 0 || organ.dislocated == -1) //don't use is_dislocated() here, that checks parent
-		return 0
+		return FALSE
 
 	user.visible_message("<span class='warning'>[user] begins to dislocate [src]'s [organ.joint]!</span>")
 	if(do_after(user, 100))
 		organ.dislocate(1)
 		src.visible_message("<span class='danger'>[src]'s [organ.joint] [pick("gives way","caves in","crumbles","collapses")]!</span>")
-		return 1
-	return 0
+		return TRUE
+	return FALSE
 
 //Breaks all grips and pulls that the mob currently has.
 /mob/living/carbon/human/proc/break_all_grabs(mob/living/carbon/user)
-	var/success = 0
+	var/success = FALSE
 	if(pulling)
 		visible_message("<span class='danger'>[user] has broken [src]'s grip on [pulling]!</span>")
-		success = 1
+		success = TRUE
 		stop_pulling()
 
 	if(istype(l_hand, /obj/item/weapon/grab))
 		var/obj/item/weapon/grab/lgrab = l_hand
 		if(lgrab.affecting)
 			visible_message("<span class='danger'>[user] has broken [src]'s grip on [lgrab.affecting]!</span>")
-			success = 1
+			success = TRUE
 		spawn(1)
 			qdel(lgrab)
 	if(istype(r_hand, /obj/item/weapon/grab))
 		var/obj/item/weapon/grab/rgrab = r_hand
 		if(rgrab.affecting)
 			visible_message("<span class='danger'>[user] has broken [src]'s grip on [rgrab.affecting]!</span>")
-			success = 1
+			success = TRUE
 		spawn(1)
 			qdel(rgrab)
 	return success
@@ -388,11 +388,11 @@
 /mob/living/carbon/human/proc/apply_pressure(mob/living/user, var/target_zone)
 	var/obj/item/organ/external/organ = get_organ(target_zone)
 	if(!organ || !(organ.status & ORGAN_BLEEDING) || (organ.robotic >= ORGAN_ROBOT))
-		return 0
+		return FALSE
 
 	if(organ.applied_pressure)
 		user << "<span class='warning'>Someone is already applying pressure to [user == src? "your [organ.name]" : "[src]'s [organ.name]"].</span>"
-		return 0
+		return FALSE
 
 	var/datum/gender/TU = gender_datums[user.get_visible_gender()]
 
@@ -413,4 +413,4 @@
 		else
 			user.visible_message("\The [user] stops applying pressure to [src]'s [organ.name]!", "You stop applying pressure to [src]'s [organ.name]!")
 
-	return 1
\ No newline at end of file
+	return TRUE
\ No newline at end of file
diff --git a/code/modules/mob/living/carbon/human/unarmed_attack.dm b/code/modules/mob/living/carbon/human/unarmed_attack.dm
index adca3ee64a..43a5ae66f2 100644
--- a/code/modules/mob/living/carbon/human/unarmed_attack.dm
+++ b/code/modules/mob/living/carbon/human/unarmed_attack.dm
@@ -25,18 +25,18 @@ var/global/list/sparring_attack_cache = list()
 
 /datum/unarmed_attack/proc/is_usable(var/mob/living/carbon/human/user, var/mob/living/carbon/human/target, var/zone)
 	if(user.restrained())
-		return 0
+		return FALSE
 
 	// Check if they have a functioning hand.
 	var/obj/item/organ/external/E = user.organs_by_name["l_hand"]
 	if(E && !E.is_stump())
-		return 1
+		return TRUE
 
 	E = user.organs_by_name["r_hand"]
 	if(E && !E.is_stump())
-		return 1
+		return TRUE
 
-	return 0
+	return FALSE
 
 /datum/unarmed_attack/proc/get_unarmed_damage()
 	return damage
@@ -106,7 +106,7 @@ var/global/list/sparring_attack_cache = list()
 	user.visible_message("<span class='danger'>[user] attempts to press [TU.his] [eye_attack_text] into [target]'s eyes, but [TT.he] [TT.does]n't have any!</span>")
 
 /datum/unarmed_attack/proc/unarmed_override(var/mob/living/carbon/human/user,var/mob/living/carbon/human/target,var/zone)
-	return 0 //return true if the unarmed override prevents further attacks
+	return FALSE //return true if the unarmed override prevents further attacks
 
 /datum/unarmed_attack/bite
 	attack_verb = list("bit")
@@ -124,7 +124,7 @@ var/global/list/sparring_attack_cache = list()
 		return 0
 	if (user == target && (zone == BP_HEAD || zone == O_EYES || zone == O_MOUTH))
 		return 0
-	return 1
+	return TRUE
 
 /datum/unarmed_attack/punch
 	attack_verb = list("punched")
@@ -190,20 +190,20 @@ var/global/list/sparring_attack_cache = list()
 
 /datum/unarmed_attack/kick/is_usable(var/mob/living/carbon/human/user, var/mob/living/carbon/human/target, var/zone)
 	if (user.legcuffed)
-		return 0
+		return FALSE
 
 	if(!(zone in list("l_leg", "r_leg", "l_foot", "r_foot", BP_GROIN)))
-		return 0
+		return FALSE
 
 	var/obj/item/organ/external/E = user.organs_by_name["l_foot"]
 	if(E && !E.is_stump())
-		return 1
+		return TRUE
 
 	E = user.organs_by_name["r_foot"]
 	if(E && !E.is_stump())
-		return 1
+		return TRUE
 
-	return 0
+	return FALSE
 
 /datum/unarmed_attack/kick/get_unarmed_damage(var/mob/living/carbon/human/user)
 	var/obj/item/clothing/shoes = user.shoes
@@ -234,23 +234,23 @@ var/global/list/sparring_attack_cache = list()
 /datum/unarmed_attack/stomp/is_usable(var/mob/living/carbon/human/user, var/mob/living/carbon/human/target, var/zone)
 
 	if (user.legcuffed)
-		return 0
+		return FALSE
 
 	if(!istype(target))
-		return 0
+		return FALSE
 
 	if (!user.lying && (target.lying || (zone in list("l_foot", "r_foot"))))
 		if(target.grabbed_by == user && target.lying)
-			return 0
+			return FALSE
 		var/obj/item/organ/external/E = user.organs_by_name["l_foot"]
 		if(E && !E.is_stump())
-			return 1
+			return TRUE
 
 		E = user.organs_by_name["r_foot"]
 		if(E && !E.is_stump())
-			return 1
+			return TRUE
 
-		return 0
+		return FALSE
 
 /datum/unarmed_attack/stomp/get_unarmed_damage(var/mob/living/carbon/human/user)
 	var/obj/item/clothing/shoes = user.shoes