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mutual support stresses
gen.	взаимовыручка (Ivan Pisarev); взаимопомощь (Ivan Pisarev); взаимоподдержка (Ivan Pisarev); взаимная помощь друг другу (Ivan Pisarev); помощь друг другу (Ivan Pisarev)
Gruzovik	взаимодействие
sec.sys.	взаимная поддержка
English thesaurus
mutual support
mil., logist.	General tactics: that support which units provide to each other against an enemy, because of their assigned tasks, their position relative to each other and to the enemy, and their inherent capabilities. 2. Artillery: mission of two or more artillery units, placed under the command of various joint commanders, and tasked with providing one another with fire reinforcements in defined conditions of space, time and consumption. (FRA)
USA	That support which units render each other against an enemy, because of their assigned tasks, their position relative to each other and to the enemy, and their inherent capabilities (JP 3-31) see also close support, direct support, support

mutual support: 13 phrases in 2 subjects

General	2
Military	11