Beginner's SG AND SNIPER TEAM.

or give the sniper team multiple prepared shooting positions that can be
travelled to without the other guys getting eyeball contact, and emplacing a
mix of command detonated antipersonnel mines, and
command  detonated anti armor mines / fired anti armor rocket launchers
to cover the approaches that armor or vehicles might use to take him out.

two men,  3-4 prepared firing positions, half dozen AP mines  and
another half dozen anti-armor  mines and remote  rocket launchers  ought
to give most opponents fits....

especially if the sniper uses something really "low tech" but
uttra-modern as his  piece. laser sighted, computer asisted,  UHV,
flechette shooting AIR RIFLE and armor piercing flechette to slice through
body armor (not powered armor, body armor) like it was TP, any one?

the delay in recharging the main weapon would be easily off set by
its being  very, very, very hard to spot when shooting.   of course the
weapon could be fitted with angas tank that was good for x number of shots
before being dropped and another loaded.