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Logistics Composite Model Analysis Toolkit (LCOM ATK)

Last Updated : 10/27/2022
This is a Common Access Card (CAC) or External Certificate Authority (ECA) enabled Tool.

The Logistics Composite Model Analysis Toolkit (LCOM ATK) is a software simulation tool used to investigate reliability, availability, maintainability, and supportability (RAMS) capabilities and modernization issues of weapon systems. It is a discrete-event simulation tool employing resource queuing, stochastic processes, and Monte Carlo methods. LCOM ATK has a long legacy of use supporting capability assessments and trade-off studies for a variety of weapon systems. It is currently in use by acquisition planning and program offices throughout the Department of Defense, the test and evaluation centers, the management engineering community, and by international partners.

LCOM ATK is an extremely flexible simulation tool with numerous features and reporting options. It has a long legacy of use and is accepted and well known throughout the defense community. It is actively maintained and has been updated with a modern user interface and many other enhancements. Backward compatibility has been maintained with previous versions of LCOM. Support tools are available to assist analysts with data preparation and results visualization. Multi-volume user documentation is actively maintained. Training materials and technical support are available. However, users should know that detailed data preparation is required, the data format is complex, and this generally not considered a tool for novices.

LCOM ATK is government owned and maintained by AFLCMC/EZJS, Wright-Patterson AFB, Ohio. It is available at no cost to government offices and their contractors in support of official programs or projects. Contractors must identify a sponsoring government office.

Additional Information

Use of LCOM ATK requires an input dataset describing the operational unit, weapon system, maintenance concept, and mission schedule. This includes specifying the number of aircraft and operating locations, the components which comprise the weapon system, the pre-sortie and post-sortie processes and activities required for operation and maintenance, level of repair and associated support equipment and facilities, corresponding personnel and spares levels, and the flying schedule.

The weapon system is specified in terms of a hierarchical breakdown usually in terms of Work Unit Code (WUC) or a similar structure and includes corresponding failure rates and spares levels. Pre-sortie and post-sortie processes and activities are specified in terms of a network of tasks and include time and resources (personnel, parts/spares, support equipment, facilities) required for task completion.

LCOM ATK offers great flexibility in defining the level of detail for the simulation. A single operational unit or squadron can be modeled, or the analyst may specify units at multiple locations including multiple aircraft types. LCOM ATK does not require that the weapon system be defined to any particular level of detail. Components may be modeled or not to accommodate analysis objectives as can the depth to which components can be individually defined. For example, one component can be modeled to the 5-digit level, while others can be modeled to the 3-digit level or not modeled at all.

Task networks are typically defined to include processes for pre-sortie launch, post-sortie recover, and scheduled and unscheduled maintenance. Additional flexibility exists to accommodate modeling of weapon system configurations, deferred maintenance, cannibalization, task priority and preemption, and resource substitution. 
Flexibility exists to model usual levels of repair for flight-line, shop, depot, or any unique situation to accommodate analysis objectives. Task network structure offers typical programming constructs to support highly detailed networks involving variables, branching, looping, subroutines, etc.

LCOM ATK provides over 300 output statistics which detail and summarize simulation results. A collection of several pre and post processors are available to assist analysts in review, analysis, and documentation of simulation results. They include tools for graphical display of task networks, debugging and profiling of model data, and plotting and charting of output statistics.

LCOM ATK has been continually updated and modernized and offers regular releases for bug repair and feature enhancements. A multi-volume set of documentation is maintained. LCOM ATK has been enhanced to offer support for multiple CPU cores and parallel processing. A completely revised user interface was recently introduced which offers a modern software suite of integrated support tools, enhanced simulation control, and features for study configuration management. Other enhancements include the ability to explicitly track and report availability metrics such as operational and material availability, as well to track various levels of reliability and maintainability.

LCOM ATK is applicable to all services and commands, across the enterprise, and throughout the lifecycle. It is also a complex modeling and simulation (M&S) tool and not suited for novices.  Analysts with prior M&S experience can expect to become proficient within a few months with dedicated fulltime study.  Analysts should expect to require occasional assistance and technical support. LCOM ATK can run on any modern workstation running Microsoft Windows with Microsoft Excel.  Java is required to run the Optimizer, a sub-module of LCOM ATK. While not required, multiple CPU cores are recommended, since LCOM ATK supports parallel processing.

For more information

To obtain the latest LCOM ATK release contact: 

Email: [email protected]
Phone: 937-255-8060
Address: AFLCMC/EZJS, 1970 Monahan Way, Wright-Patterson AFB, OH 45433
LCOM can also be obtained from the LCOM ATK SharePoint site at https://intelshare.intelink.gov/sites/lcom/

Information on the Air Force Manpower Analysis Agency (AFMAA), which provides simulation modeling and analysis to determine maintenance manpower requirements for present and future weapon systems can be found at https://usaf.dps.mil/sites/AFMAA/MM/SitePages/LCOM.aspx

Processes Supported

Departments Associated

  • Air Force 

Integrated Product Support Elements Addressed 


This tool was identified as part of a product support analytical tools database provided solely to assist defense acquisition workforce professionals to identify best value product support solutions which optimize system readiness and life cycle cost. Neither the Department of Defense or the Defense Acquisition University provide any warranty of these tools, whether express, implied, or statutory, including, but not limited to, any warranty of merchantability or fitness for a particular purpose or any warranty that the contents of the item will be error-free. This analytical tools database should under no circumstances be considered as being all-encompassing, and is in no-wise meant to endorse the capabilities or products of any particular individual, company, or organization.


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