A key capability of the Land Warrior development effort was the interoperability with the Stryker family of combat vehicles, attained through a Stryker Vehicle Integration Kit or VIK. Land Warriors mounted in the Stryker vehicle were to be provided voice, data and power connectivity through an umbilical connection, as an extension of the individual soldier's Personal Area Network. The mounted Land Warriors were to have the capability of communicating voice and data with each other, the vehicle crew, Land Warriors external to the vehicle and other Land Warrior units mounted in other Stryker vehicles. Communications with the vehicle crew were to be achieved by interfacing to the Vehicle Intercom System. Dismounted Land Warriors, when within communications range of their Stryker vehicle, were to have the same voice connectivity and Army Battle Command System interoperability as the mounted Land Warrior. The Vehicle Integration Kit (VIK) was being developed in a spiral fashion to help manage development risk. The first spiral produced early VIK prototypes used to validate physical integration approaches in the various vehicle configurations. It also demonstrated Land Warrior soldier voice connectivity with the Stryker crew-members in and around the vehicle through the Vehicle Intercom System. There were plans to integrate the Boomerang Mobile Shooter Detection System onto the Stryker vehicle as part of the Land Warrior system. Program outcome Land Warrior was the first U.S. Army soldier network system to be used in combat since the networked soldier concept began in 1989. 229 Land Warrior ensembles were deployed by the 4th Battalion, 9th Infantry Regiment to Iraq from May 2007 to June 2008. A Stryker Brigade later deployed with the system to Afghanistan, and Land Warrior remained in use until spring 2012. The Army built upon Land Warrior with the Ground Soldier System (GSS) as its successor, an advanced dismounted soldier integrated situational awareness system that entered technology development in February 2009. GSS Increment 1 was renamed Nett Warrior in June 2010 after Medal of Honor recipient Robert B. Nett (although the term "Nett" has frequently been misinterpreted as a reflection of its tactical networking features). Nett Warrior was first demonstrated in spring 2011, which then was essentially the 10-pound Land Warrior ensemble with some enhanced additional software. Later iterations focused on a hand-held solution that integrated a commercial hand-held screen device with the Rifleman radio, simplifying the system and decreasing weight to . Nett Warrior utilizes enhanced smartphones,