Marine with an M4

marine m4 carbine

Sgt. Kerry Williams, squad leader, monitors the progress of his squad as they assault up to an enemy position during a live-fire range. Marines from Battalion Landing Team 1st Battalion, 6th Marine Regiment, 24th Marine Expeditionary Unit, spent three days in the field perfecting small unit leadership through various exercises. Marines practiced leading squads and fire teams on patrols, taking enemy fire, closing with their foe and using their fire power to win the battle at Fort Pickett, Va., Sept. 16-18. Infantry units focus on a decentralized leadership style that allows them to be more agile on the battlefield. Photo by: Cpl. Randall A. Clinton

Note the M4 carbine. The Marines are shifting away from 9mm pistols.

Polish Heavy Sniper Rifle

wkw wilk tor anti-materiel rifle

USAREUR plays key role for Immediate Response 07
Photo by Spc. Jerry Wilson
September 19, 2007

Sgt. Chad Droege, Illinois Army National Guard, learns how to fire a Polish sniper rifle from Polish army Cpl. Lukasz Bocwinski during Immediate Response 07 at the Wedrzyn Training Area in Poland.

That appears to be a WKW Wilk Tor 12.7mm anti-materiel rifle. Photo from Army.mil.