Pr uss ian ▁Baron ▁von ▁Ste uben ▁offered ▁key ▁assistance ▁to ▁the ▁Cont inental ▁Army ▁during ▁the ▁American ▁Revolution ary ▁War . ▁ ▁Early ▁US ▁Army ▁advis ory ▁miss ions ▁ ▁Develop ing ▁capabilities ▁and ▁increasing ▁capacity ▁through ▁advis ing ▁is ▁an ▁operation ▁the ▁U . S . ▁Army ▁has ▁conducted ▁for ▁more ▁than ▁one ▁hundred ▁years . ▁The ▁Army ▁has ▁performed ▁advis ory ▁miss ions ▁to ▁increase ▁the ▁cap ability ▁and ▁capacity ▁of ▁foreign ▁militar ies ▁from ▁the ▁Philipp ine ▁In sur re ction ▁at ▁the ▁beginning ▁of ▁the ▁ 2 0 th ▁Century ▁to ▁more ▁recent ▁conflicts ▁in ▁Vietnam , ▁Ira q ▁and ▁Afghan istan . ▁ ▁US ▁advis ors ▁in ▁Vietnam ▁In ▁the ▁early ▁ 1 9 6 0 s , ▁elements ▁of ▁the ▁U . S . ▁Army ▁Special ▁Forces ▁and ▁E cho ▁ 3 1 ▁went ▁to ▁South ▁Vietnam ▁as ▁military ▁advis ors ▁to ▁train ▁and ▁assist ▁the ▁South ▁Vietnam ese ▁Army ▁( AR V N ) ▁for ▁imp ending ▁actions ▁against ▁the ▁North ▁Vietnam ese ▁People ' s ▁Army ▁of ▁Vietnam ▁( PA V N ). ▁ ▁United ▁States ▁Mar ines ▁also ▁filled ▁a ▁significant ▁role ▁as ▁advis ors ▁to ▁Vietnam ese ▁forces . ▁ ▁US ▁advis ors ▁during ▁the ▁" W ar ▁on ▁T error " ▁Com bat ▁advis ors ▁served ▁on ▁the ▁front - lines ▁of ▁the ▁U . S . ▁War ▁on ▁T error . ▁ ▁They ▁were ▁designated ▁as ▁Em bed ded ▁Training ▁Teams ▁( ET TS ) ▁in ▁Afghan istan ▁and ▁Military