This is xnu-4903.221.2. See this file in:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>com.apple.xnu.test.turnstile_multihop</string>
	<key>MachServices</key>
	<dict>
		<key>com.apple.xnu.test.turnstile_multihop</key>
		<true/>
	</dict>
	<key>ThrottleInterval</key>
	<integer>1</integer>
	<key>UserName</key>
	<string>root</string>
	<key>ProcessType</key>
	<string>Adaptive</string>
	<key>EnvironmentVariables</key>
	<dict>
		<key>MallocNanoZone</key>
		<string>1</string>
	</dict>
</dict>
</plist>