Everyone seems to favor wearing US-style Kevlar helmets and woodland-ish camo.
Malaysia, Thailand, PRC, Taiwan, and now you say Cambodia. Visual ID of enemy combatants gonna get very difficult. Not too long ago, Singapore was dressed like that, too.
Thai troops are now mainly using a new digitial design, introduced about 3 years ago. Prior to the new digital pattern, Singapore's camo was a woodland variation of the U.S. ERDL design. Vietnam's troops, despite the introduction of a new kelvar type helmet, still largely use the Vietnam war era pith helmets, which provide much, much less protection but are more comfortable than kelvar helmets
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Malaysia's current camo pattern [introduced about 13 years ago] is described by collectors as the 'zebra' pattern. The Malaysian 'zebra pattern has also been applied to armoured/soft skinned vehicles and artillery, using IR resistant paint. Prior to this a 'brushstroke' pattern was used by Malaysia for many years, based on and sharing many similiarities with the WW2 Denison pattern, Rhodesian 'brushstroke' and the Belgian 'moons and ball's. The RMN's Paskal uses a locally made copy of the U.S. 'woodland' and the MMEA uses the U.S. ACU. In terms of numbers of different camo patterns used, the Philippines and Indonesia top the list in ASEAN.