diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 571db42..6aeac0e 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -1,6 +1,13 @@
 on:
   workflow_call:
     inputs:
+      additional_certificate_arns:
+        # Arrays are not supported by Github resuable workflow inputs. It might be best to
+        #  move back to defining each environment workflow completely independently.
+        default: "[]"
+        description: "A set of additional ACM certificate ARNs to be assigned to the ALB listener."
+        required: false
+        type: string
       aws_region:
         description: The AWS region target for deployment
         required: true
@@ -96,6 +103,7 @@ jobs:
         id: terraform-apply
         run: |
           terraform apply -auto-approve \
+            -var="additional_certificate_arns=${{ inputs.additional_certificate_arns }}" \
             -var="aws_region=${{ inputs.aws_region }}" \
             -var="aws_replication_region=${{ inputs.aws_replication_region }}" \
             -var="dns_name=${{ inputs.dns_name }}" \
diff --git a/.github/workflows/production.yml b/.github/workflows/production.yml
index 3ee86ca..bba1534 100644
--- a/.github/workflows/production.yml
+++ b/.github/workflows/production.yml
@@ -23,10 +23,11 @@ jobs:
     #  So now we're hardcoding the values here and using it as a manifest. Please see
     #  commit 1ec7a0346abc04b73c03e35c0e228e9dba14300c for the previous implementation.
     with:
+      additional_certificate_arns: '[\"arn:aws:acm:us-east-1:510777193308:certificate/9a15e75a-1d74-4349-9ed0-65b0df777a22\"]'
       aws_region: us-east-1
       aws_replication_region: us-west-2
       aws_s3_terraform_state_object_key: production.tfstate
-      dns_name: aws-ecs-demo.carlucci.network
+      dns_name: prod.aws-ecs-demo.carlucci.network
       environment_name: prod
       vpc_cidr_index: 0
     secrets:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36a4ee3..fc5c9c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.3.0
+
+* Additional ACM certificate assignment
+
 # 0.2.1
 
 * HOTFIX: Fix production dns_name in manifest
diff --git a/terraform/ec2.tf b/terraform/ec2.tf
index cb0c2a9..a990375 100644
--- a/terraform/ec2.tf
+++ b/terraform/ec2.tf
@@ -45,7 +45,8 @@ resource "aws_security_group_rule" "alb_egress_all" {
 # TODO: adopt "Encryption Everywhere" policy by protecting internal traffic
 #  between the ALB and the application service as well (#15)
 resource "aws_lb_target_group" "alb" {
-  name        = local.namespace
+  # name not specified as it creates conflicts when resource needs to be replaced. Depend
+  #  on tags to identify target groups in the console.
   port        = 443
   protocol    = "HTTPS"
   target_type = "ip"
@@ -59,6 +60,11 @@ resource "aws_lb_target_group" "alb" {
   }
 
   vpc_id = aws_vpc.vpc.id
+
+  lifecycle {
+    # For if/when ports change
+    create_before_destroy = true
+  }
 }
 
 resource "aws_lb" "alb" {
@@ -96,3 +102,11 @@ resource "aws_lb_listener" "https" {
   port              = 443
   protocol          = "HTTPS"
 }
+
+# Support the assigment of external certificates by ARN
+resource "aws_lb_listener_certificate" "additional" {
+  for_each = var.additional_certificate_arns
+
+  listener_arn    = aws_lb_listener.https.arn
+  certificate_arn = each.value
+}
diff --git a/terraform/ecs.tf b/terraform/ecs.tf
index 036419c..64d4a8c 100644
--- a/terraform/ecs.tf
+++ b/terraform/ecs.tf
@@ -33,6 +33,16 @@ data "aws_iam_policy_document" "ecs_task_assume_role" {
       identifiers = ["ecs-tasks.amazonaws.com"]
       type        = "Service"
     }
+    condition {
+      test     = "ArnLike"
+      values   = ["arn:aws:ecs:${var.aws_region}:${local.account_id}:*"]
+      variable = "aws:SourceArn"
+    }
+    condition {
+      test     = "StringEquals"
+      values   = [local.account_id]
+      variable = "aws:SourceAccount"
+    }
   }
 }
 
@@ -42,7 +52,7 @@ resource "aws_iam_role" "ecs_task_execution" {
 }
 
 # Use the AWS-provided managed role for basic logging and ECR repository permissions
-resource "aws_iam_role_policy_attachment" "legacy_listener_aws_task_execution_role_policy" {
+resource "aws_iam_role_policy_attachment" "hello_world_aws_task_execution_role_policy" {
   role       = aws_iam_role.ecs_task_execution.name
   policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"
 }
diff --git a/terraform/variables.tf b/terraform/variables.tf
index 862a0a4..97c767e 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -1,3 +1,9 @@
+variable "additional_certificate_arns" {
+  default     = []
+  description = "A set of additional ACM certificate ARNs to be assigned to the ALB listener."
+  type        = set(string)
+}
+
 variable "aws_region" {
   default     = "us-east-1"
   description = "The AWS region name in which the main infrastructure should be deployed."