What does MRS stand for?

Airline of the Marshall Islands - ICAO designator (FAAC)

Maars - Alaska - Seismograph station code, US Geological Survey (SEIS)

Mado Robin Society - Defunct (EA)

Magnetic Reed Switch

Magnetic-Resonance Spectroscopy - Biochemistry

Magnetic Resonance Spectrum

Maintenance and Recording System (XSAL)

Maintenance Repair and Service (ACAE)

Maintenance Reporting System - Army

Maintenance Requirement Substantiated (MSA)

Malfunction Reporting System - Boeing

Management Relations Survey - Test

Management Reporting System

Management Review System (NASA)

Manipulator Repair Shop (NRCH)

Manned Reconnaissance Satellite - Air Force

Manned Repeater Station - Telecommunications (OA)

Manufacturers Railway Co. - AAR code

Maragus - Language code (ETLW)

Marches (ROG)

Marginal Rate of Substitution - Economics

Mariah Resources Ltd. - Vancouver Stock Exchange symbol

Market Research Society - British

Marseille - France - Airport symbol (OAG)

Master Radar Station (SAUO)

Master Repair Schedule - Air Force (AFM)

Material Request - or Requirement Summary

Material Requirements Schedule

Material Research Society Meeting (SAUO)

Material Returned to Store - NASA (KSC)

Material Routing Slip

Materials Research Society (EA)

Materiel Repair System - Air Force (AFM)

Mears - NCIC firearms make code (NCIC)

Media Recognition System - Computer science

Media Report Service (NITA)

Media Resource Service - Scientists' Institute for Public Information - Information service or system (IID)

Medical Readiness System (SAUO)

Medical Receiving Station

Medical Reception Station - Military

Medical Research Society - British

Medical Resupply Set Model (SAUO)

Medium Range Search

Medium-Range SONAR (NVT)

Medium Range Surveillance (SAUS)

Melkersson-Rosenthal Syndrome - Medicine (DMAA)

Memo Routing Slip

Meritor Automotive - NYSE symbol (SPSG)

Mesoscale Research Section (SAUO)

Metals Removal System - Petroleum refining

Metastasis Research Society (SAUO)

Methicillin-Resistant Staphylococcus - Qureus - Medicine (DAVI)

Methicillin-Resistant Staphylococcus Aureus - Antimicrobial therapy (MEDA)

Metro Recovery Systems (EFIS)

Michigan Radiological Society (SAUO)

Microfilm Replacement System - Computer science

Micro Reflective Structure - Computer science

Midcoast Energy Resources, Inc. - AMEX symbol (SAG)

Midlands Research Station - British Gas (WDAA)

Migration and Refugee Services (EA)

Military Radar Stations (ACAE)

Military Railway Service - Army

Military Requirements Study (AAGC)

Military Retirement System

Minimum Radial Separation - Manufacturing term

Minimum Reporting Standard - Broadcasting (NTCM)

Minimum Residual Shutdown - Space launch term (IGSL)

Mini-Reconstruction System (MCD)

Ministry of Recreation and Sport - British (AD)

Missile Reentry Systems (AFIT)

Missile Round Simulator

Mission de Ras Shamra - A publication (BJA)

Mission Radio System (SAUO)

Mission Rehearsal System (SAUS)

Mission-Related Software

Mistress (DAVI)

Mitochondria Research Society - Association (EA)

Mixed Reproductive Strategy - Avian biology

Mobile Radio Service (DA)

Mobile Reception System (SAUS)

Mobile Remote Servicer (SSD)

Mobility Requirements Study - DoD

Mobilization Requirement Study

Mobilization Reserve Stocks - Army

Moderator Recovery System (COE)

Modification Record Sheet - NASA (KSC)

Monitored Retrievable Storage - of nuclear waste

Monitored Retrievable Storage Facility - Environmental science (COE)

Monorail System

Moore-Rott-Sears - Theory

Mortgage-Related Security (EMRF)

Mothers Return to School

Motor Rotation Stand

Mountain Rescue Service (AD)

Mountain Research Station - Research center (RCD)

Mouvement Republicain Senegalais - Senegalese Republican Movement - Political party (PPW)

Movement and Reinforcement Study (MCD)

Movement Report Sheet - Military

Movement Report System - Military

M-R-S Manufacturing Co. - NCIC construction equipment make code (NCIC)

M.R. Yachts, Danville, CA - Manufacturer code for watercraft hull identification number (USCG)

Multilateral RADAR Strike System - Air Force (MCD)

Multilateral RADAR Surveillance System - Air Force (MCD)

Multiple Representative Sections - Pathology (DAVI)

Multiple Rocket System (SAUS)

Multipurpose Research System

Multipurpose Reusable Spacecraft (IIA)

Multirole System (SAUS)

Multispectral Resource Sampler (GIS)

Multispectral Resource Scanner (ACAE)

Music Reading Software

Muzzle Reference System (MCD)

Sandinista Renovation Movement (Nicaragua) - Political party (PSAP)

Marginal Rate of Substitution (AD)

Missus (AD)

Mistress (AD)