I quote the Wiki on "infantry."
"Due to the very nature of the "work" with firearms, explosives, physical-emotional stress, and genuine violence, casualties and or deaths are not uncommon in both war and in peace. The infantryman is expected and trained to continue on with the mission despite personal fear, despair, fatigue and injury; through the foe, to the objective, though he be the last man.
Life in an active duty infantry unit is rigorous, a 24 hour cycle makes for long hours of exercise/training/fighting/patrolling in often brutal climates armed only with the weapons, ammunition and essential war fighting equipment that they can carry on their backs. Remaining space is meant for a meal rations to fight their hunger. Infantry are usually afforded upwards of 4000 calories per day when on operations. Very little space is afforded for comforts. The physical demands are extreme. Forced marches, carrying in excess of 80lbs (36 kg) of equipment upwards of 25 miles (40 km) at a 4-6mi/h (6–10 km/h) pace is not uncommon. 15 mile runs at a forced pace are common as well. Mastering one’s body is essential, as eating just one meal a day may be experienced occasionally when situations dictate such. Teamwork and absolute trust are essential for the survival of not only the individual, but the unit as a whole.
Very strong bonds that last an entire life time form within these infantry units and there is a sort of professional respect given from one infantryman to another, both inside and outside of the military, which is based on a common understanding of what life is like on the inside of an infantry battalion and the character and discipline of the individuals who comprise them." Wikipedia
The "poor bloody infantry" are the people whose job it is to occupy the ground, to define the area of friendly control by their very presence. In a counter-guerrilla war like the one that Senator Hagel fought in, they are the people most frequently in the close presence of the enemy.
90% of all casualties are experienced in the infantry, which,in the US Army, is often referred to as the "Queen of Battles." Do not confuse the infantry with the armored troops, the artillery, etc. pl