Army Rank Onesies
The US Army currently employs six types of infantry: light infantry (consisting of four sub-types), "Stryker infantry", and mechanized infantry. The infantrymen themselves are essentially trained, organized, armed, and equipped the same, save for some having airborne, air assault, and/or Ranger qualification(s), the primary difference being in the organic vehicles (or lack thereof) assigned to the infantry unit, or the notional delivery method (i.e., parachute drop or heliborne) employed to place the infantryman on the battlefield. All modern US Army rifle platoons contain three nine-man rifle squads, with each type of infantry having a discrete TO&E.
Tags: agent-carter, infantry, branch, military, insignia
Airborne forces are military units, usually light infantry, set up to be moved by aircraft and "dropped" into battle. Thus they can be placed behind enemy lines, and have the capability to deploy almost anywhere with little warning. The formations are limited only by the number and size of their aircraft, so given enough capacity a huge force can appear "out of nowhere" in minutes, an action referred to as vertical envelopment.
Tags: navy, force, air, marine, reserve