washington u.s. military say friday identify new areas could work ally put pressure iran support president donald trump new strategy promise far confrontational approach tehran trump strike blow 2015 iran nuclear agreement friday defiance world power choose certify tehran comply deal warn might ultimately terminate also promise address iran broadly include support extremist group middle east major adrian rankine-galloway defense department spokesman tell reuters pentagon assess position force well plan offer detail identify new areas work ally put pressure iranian regime neutralize destabilize influence constrain aggressive power projection particularly support terrorist group militants say u.s. defense secretary jim mattis say first goal would talk u.s. ally europe middle east elsewhere gain share understand iran action certainly intend dissuade ship arm place like yemen explosives bahrain things surrogates like lebanese hezbollah mattis say u.s. military long strident critic iran accuse directly indirectly try undermine unite state ally include iraq syria yemen tensions escalate recent months syria american pilot shoot two iranian-made drone summer still aggressive approach iran could trigger backlash iran elite islamic revolutionary guard corps irgc force back include iraq u.s. troop fight islamic state try keep distance shi ite militia align iran u.s force iraq quite expose coalition force quite expose risk attack iranian elements choose say jennifer cafarella lead intelligence planner institute study war think-tank washington u.s. military analyze explosively form penetrator efp kill american soldier iraq month reappearance device iran-backed shi ite militia routinely use target american troop iraq withdrawal 2011 startle u.s. officials cia director mike pompeo note device detonate area control militia back tehran evidence direct link iran closely examine tragic incident pompeo say wednesday cafarella say kill u.s. soldier may warn iran think possible iranians attempt signal commitment retaliate u.s. strategy say mattis say unite state watch new provocations iran ask whether think tehran might retaliate say would ill advise attack us reuters previously report options increase pressure iran include aggressive u.s. interceptions iranian arm shipments houthi rebel yemen could also direct u.s. naval force react forcefully harass arm irgc speed boat pentagon friday detail series major concern iran include ballistic missile development cyber attack unite state u.s. ally pentagon promise review u.s. security cooperation activities ally region something could lead alterations u.s. arm sales military exercise also signal willingness re-examine position roughly 70,000 american troop pentagon say station middle east still mattis say right change posture pentagon identify new areas pressure iran review plan