Abbreviations used in the 'Service' field of a record:

1C - 1st Class
1SGT - First Sergeant
1LT - First Lieutenant
2C - 2nd Class
2LT - Second Lieutenant
3C - 3rd Class
A.C. - Army Corps
AG - Adjutant General
AAG - Assistant Adjutant General
AAAG - Acting Assistant Adjutant General
AACS - Acting Assistant Commissary of Subsistence
AAQM - Acting Assistant Quartermaster
ACT - Acting
ADC - Aide-de-Camp
ADJ - Adjutant
ADJT - Adjutant
AIG - Assistant Inspector General
A&IG - Adjutant & Inspector General
AoP - Army of the Potomac
A.P.M. - Additional Paymaster
AQM - Assistant Quartermaster
ARTIF - Artificer
ASURG - Assistant Surgeon
AWOL - Away Without Official Leave
BGen - Brigadier General
BGLR - Bugler
BNDMSTR - Bandmaster
BTRY - Battery
Bvt - brevet
enl - enlisted
CH BGLR - Chief Bugler
CMSR - Compiled Military Service Record
CON - Consolidated (a regiment)
CS - Commissary of Subsistence
com - commissioned
CPL - Corporal
CAPT - Captain
cred. - credited to
CS - Commissary of Subsistence
CSSGT - Commissary Sergeant
CSA - Confederate States Army
d/dis - died of disease
d/prison - died in prison*
d/svc - died in service (cause unknown)
d/wds - died of wounds
dis/dsb - discharged for disability
dis/dishon - dishonorable discharge
DRMMAJ - Drum Major
DRMR - Drummer
dsrtd - deserted
EGBS - Eastern Gulf Blockading Squadron ENG - Engineer
FFR - Fifer
FFRMAJ - Fife Major
FN - Fireman
GCM - general court martial
gsw - gunshot wound
Hosp. - Hospital
Hosp. Stwrd - Hospital Steward
IG - Inspector General, INF - Infantry
kia - killed in action
LARTY - Light Artillery
LNDS - Landsman
MGen - Major General
m/i - mustered in
m/o - mustered out
MSCN - Musician
mwia - mortally wounded in action
NAS - North Atlantic Squadron n.d. - no date
nfr - no further record
P.M. - Paymaster
pow - taken prisoner
pr - promoted
PRIN MSCN - Principle Musician
prld - paroled
QM - Quartermaster
QMGen - Quartermaster General
QMSGT - Quartermaster Sergeant
RCM - Regimental Court Martial
RCRT - Recruit
red - reduced (demoted)
Regtl - Regimental
resgd - resigned
RQM - Regimental Quartermaster
SDLR - Saddler
SGT - Sergeant
SGTMJR - Sergeant Major
SOWD - Special Order, War Department
SURG - Surgeon
SVC - Service
tr to/from - transferred to/from
Unasgd - Unassigned
USA - US Army
USCA - US Colored Artillery
USCI - US Colored Infantry
USSS - US Sharpshooters
USV - US Volunteers
VHAC - Vermont Heavy Artillery Company
VRC - Veterans Reserve Corps
VVC - Vermont Volunteer Cavalry
VVI - Vermont Volunteer Infantry
WGNR - Wagoner
wdd - wounded
* NOTE: d/prison may include those who died on parole as a result of imprisonment

Source of roster information: basic information on enlistments, promotions, casualties, etc. comes from the 1892 "Revised Roster of Vermont Volunteers," and additional information from a variety of sources, including cemetery, pension, census and other records as well as obituaries and published biographies of individuals, when available.