Military Dive Rebreathers MR3400 Multi-Role Special Forces Diving Apparatus HomeSafety and SurvivalMilitary Dive RebreathersMR3400 Multi-Role Special Forces Diving Apparatus The MR3400 S-24 Combi is a self-contained chest mounted apparatus developed for shallow water and covert operations. Home Capabilities Customers Suppliers Careers News About Military Dive Rebreathers Product Contacts USA Cobham Mission Systems, Davenport, USA 2734 Hickory Grove Road, Davenport, Iowa, USA 52804. Tel +1 563 383 6000 Fax +1 563 383 6430 Cobham Mission Systems Davenport LSS Inc. View location Contact office