Used images:

From flickr.com CC attribution images:
Cough manners! / CB and GK / CC BY 2.0
IMG_8769.JPG / Austen Squarepants / CC BY 2.0
(2/365) Ow headache... / Sarah / CC BY 2.0
Pedrinhas Subzone / Rodger Rocha / CC BY-ND 2.0
Surgery / Army Medicine / CC BY 2.0
Franken-scott 2 / Scott Zona / CC BY 2.0
Oklahoma Army National Guard, 120th Med. Co. - Foster / The National Guard / CC BY 2.0
DN-ST-93-05083 / Expert Infantry / CC BY 2.0
Day 59, Project 365 - 12.18.09 / William Brawley / CC BY 2.0
Louisiana native/Sailor takes a blood sample during a Continuing Promise 2011 event in Puerto San Jose, Guatemala / Official Navy Page / CC BY 2.0
DA-ST-86-05881 / Expert Infantry / CC BY 2.0
Pain IV / Deborah Austin / CC BY 2.0
My Life Right Now / Elizabeth Murphy / CC BY 2.0