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==History==
In 1990, the '''[[Defense Advanced Research Projects Agency]] (DARPA)''' employed '''The [[MITRE]] Corporation''' to study the application of [[Distributed Interactive Simulation|distributed interactive simulation]] principles employed in '''[[SIMNET]]''' to aggregate-level constructive training simulations. Based on prototype efforts, a community-based experiment was conducted in 1991 to extend SIMNET to link the US Army's [https://archive.today/20130822204558/http://www.peostri.army.mil/PRODUCTS/CBS/home.jsp '''Corps Battle Simulation (CBS)'''] and the US Air Force's [https://web.archive.org/web/20041019105713/http://afmsrr.afams.af.mil/index.cfm?RID=SMN_AF_1000000 '''Air Warfare Simulation (AWSIM)''']. The success of the prototype and users' recognition of the value of this technology to the training community led to development of production software. The first ALSP confederation, providing air-ground interactions between CBS and AWSIM, supported three major exercises in 1992.
By 1995, ALSP had transitioned to a multi-Service program with simulations representing the US Army (CBS), the US Air Force (AWSIM), the US Navy ('''RESA'''), the US Marine Corps ([https://web.archive.org/web/20070826203844/http://www.29palms.usmc.mil/dirs/ont/mands/mwts.asp '''MTWS''']), electronic warfare ('''JECEWSI'''), logistics ('''CSSTSS'''), and intelligence ([https://web.archive.org/web/20070825010050/http://www.peostri.army.mil/PRODUCTS/TACSIM/ '''TACSIM''']). The program had also transitioned from DARPA's research and development emphasis to mainstream management by the US Army's Program Executive Office for Simulation, Training, and Instrumentation ([http://www.peostri.army.mil '''PEO STRI'''])
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==Motivation==
In 1989, the [[Warrior Preparation Center]] (WPC) in Einsiedlerhof, Germany hosted the computerized military exercise ACE-89. The Defense Advanced Research Projects Agency ([[DARPA]]) used ACE-89 as a technology insertion opportunity by funding deployment of the [[Defense Simulation Internet]] (DSI). Its packetized video teleconferencing brought general officers of NATO nations face-to-face during a military exercise for the first time; this was well received. But the software application of DSI, distribution of Ground Warfare Simulation (GRWSIM), was less successful. The GRWSIM simulation was unreliable and its [[distributed database]] was inconsistent, degrading the effectiveness of the exercise.
DARPA was funding development of a distributed tank trainer system called [[SIMNET]] where individual, computerized, tank-crew trainers were connected over local area networks and the DSI to cooperate in a single, virtual battlefield. The success of SIMNET, the disappointment of ACE-89, and the desire to combine existing combat simulations prompted DARPA to initiate research that lead to ALSP.
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===ALSP Broadcast Emulator (ABE)===
An ALSP Broadcast Emulator (ABE) facilitates the distribution of ALSP information. It receives a message on one of its communications paths and retransmits the message on all of its remaining communications paths. This permits configurations where all ALSP components are local to one another (on the same computer or on a [[local area network]]). It also permits configurations where sets of ACMs communicate with their own local ABE with inter-ABE communication over wide area networks.
==Communication Scheme==
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