function Remove-AlkamiServiceFabricApplication {
<#
.SYNOPSIS
    Removes applications from the service fabric cluster.
.PARAMETER packages
    One or more packages to remove from the cluster.
.PARAMETER hostname
    A single server hostname from the target Service Fabric cluster.
.PARAMETER Deregister
    Deregisters the image the service is using, for a fresh deployment next time.
#>
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $true)]
        [AllowNull()]
        [object[]]$Packages,
        [Parameter(Mandatory = $false)]
        [string]$Hostname = "localhost",
        [Parameter(Mandatory = $false)]
        [switch]$Deregister
    )

    $loglead = Get-LogLeadName;

    if(Test-IsCollectionNullOrEmpty $Packages) {
        Write-Verbose "$loglead There were no packages to remove. Returning..";
        return;
    }

    # Connect to SF cluster.
    Connect-AlkamiServiceFabricCluster -hostname $Hostname | Out-Null;
    $applications = Get-AlkamiServiceFabricApplications -ComputerName $Hostname;

    Write-Verbose "$loglead Searching for packages to remove:";
    foreach($package in $Packages) {
        Write-Verbose "$loglead $($package.Name) $($package.Version)";
    }

    # Filter down the applications to the packages we are actually removing.
    $applicationsToRemove = @();
    foreach($package in $Packages) {
        # Just remove the package if a version isn't specified, or otherwise a specific version if it is specified.
        $applicationToRemove = $applications | Where-Object { ($_.Name -eq $package.Name) -and (($null -eq $package.Version) -or $($_.Version -eq $package.Version)); };
        if($null -ne $applicationToRemove) {
            $applicationsToRemove += $applicationToRemove;
        }
    }

    if(Test-IsCollectionNullOrEmpty $applicationsToRemove) {
        Write-Verbose "$loglead Found no matching packages to remove. Returning..";
        return;
    }

    Write-Verbose "$loglead Starting removal of $($Packages.Count) package(s).";

    # Remove all of the relevant SF applications.
    foreach($application in $applicationsToRemove) {

        Write-Host "$loglead Removing $($application.ServiceFabricApplicationName)";
        Remove-ServiceFabricApplication -ApplicationName $application.ServiceFabricApplicationName -Force | Out-Null;

        if($Deregister.IsPresent) {
            Write-Host "$loglead Unregistering $($application.ServiceFabricApplicationTypeName)-$($application.Version)";
            Unregister-ServiceFabricApplicationType -ApplicationTypeName $application.ServiceFabricApplicationTypeName -ApplicationTypeVersion $application.Version -Force;
        }
    }

    Write-Verbose "$loglead Application removal complete.";
}