It's essentially Corporal chevrons (two stripes), with a letter "T" underneath. See related link for a visual.
Subdued rank insignia in the US Armed Forces wasn't introduced until the Vietnam war.
Lieutenant Colonel, the insignia is a silver oak leaf.
Three chevrons, with the points facing down. See related link at the bottom. On their fatigue uniforms I saw them wearing in Afghanistan and Iraq, there would be a tab at the front of their blouse. The rank insignia would be embroidered on a loop, and this tab would be run through that loop. The actual rank insignia used by the Australians is more the same of those used by the British and other Commonwealth Dominion forces - there may be slight variations (such as the Canadian rank insignia, which has the rank of Master Corporal, and incorporates the Canadian maple leaf into the insignia), but the structure follows the British example, and the crown is an ever present feature on the insignia badges of certain ranks, military unit insignia, etc. (note: this only applies to the actual Commonwealth Dominions/Realms, who acknowledge the British monarch as head of state. Not all countries who are members of the Commonwealth of Nations are Commonwealth Dominions, and the crown is absent from their insignia).
There are a bunch of them. Branch of Service insignia, rank insignia and other insignia that aren't unit-specific are found in Army Regulation 670-1, which is downloadable from a few places. Distinguished Unit Insignia, which everyone calls unit crests, and patches are not in that reg; check the Institute of Heraldry website at http://www.tioh.hqda.pentagon.mil/
There isn't a "bomber" rank in the Marine Corps. There is, however, a Gunner. Its symbol is a bursting bomb. Gunner is also not a rank, but a title. This insignia is awarded to the highest ranking CWO in a weapons company.
no
No
Lieutenant Colonel insignia is identified by a Silver Maple Leaf. In the US Army it is a cluster of silver OAK leaves. In the British army it is a crown and a single 'pip'.
Insignia of rank
Insignia of rank
Subdued rank insignia in the US Armed Forces wasn't introduced until the Vietnam war.
Which insignia did you have in mind, since there's a few different insignia worn? There's rank insignia, branch insignia, and regimental crests.
bjmp ranks
The word insignia means emblem of military rank, a sign or a token and it comes from the Latin language: IN - towards, SIGNUM - sign. Later it transforms to insignis and then insigne and around the 17th century the word insignia is finalized. Plural can be insignia, as well as insignias.
The hat insignia and rank insignia contain the eagle from the great seal
A badge of office, rank, membership, or nationality; an emblem.
The rank is placed on a single rank slide on the front of the breast. The unit insignia is placed on the right arm and is called a Tactical Recognition Flash (TRF)