Below data, from "old"/"original" Redcatcher-assn website:
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Cambodian
199th Light Infantry Brigade Areas of Operations/Base Locations
199th Bases
A - YU0340 Myron, 5/12 (1970)
B - YU0337 Brown, 5/12 (1970)
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Dinh Quan
199th Light Infantry Brigade Areas of Operations/Base Locations
199th Bases
A - YT1740 Melinda, 3/7 (1970)
B - YT2527 Gladys, 5/12 (1969)
C - YT3025 Farrell 4/12, (1968)
D - YT4328 Nui Dat, 4/12 (1970)
E - YT4429 Libby, 5/12 (1969)
F - YT5638 Nancy, 4/12 (1969) - Nancy II
G - YT6825 Joy, 4/12 (1969
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Ham Tan
199th Light Infantry Brigade Areas of Operations/Base Locations
Allied Bases
XT9226 Tanh Linh, Special Forces A Team (also know as Rising Sun during 199th operations in 1970 - all Bns had elements there at one time of another)
199th Bases
A - XT6825 Joy, 4/12 (1969)
B - XT7324 Rita, 4/12,2/3 (1970)
C - XT7714 Bay, (1970)
D - XT8304 Silver, 2/3 (1970)
E - XS8297 Strike/Oanh Tach, 2/3 (1970)
F - XT8615 Sao Mai, 3/7,2/3 (1970)
G - YT8713 Dinh, 3/7,4/12 (1970)
H - YT8920 Moon, 3/7 (1970)
I - YT9321 Tien Don Suc, 2/3 (1970)
J - YT9526 Deeble, 3/7, 5/12 (1970)
K - YS9596 Da Mai (1970)
L - YS9689 Howie, 2/3 (1970)
M - YS9884 Riveria / Ham Tan, 3/7,2/3 (1970)
N - ZS0098 Flower (1970)
O - ZT0105 Mat, 5/12,3/7 (1970)
P - ZT0225 Dreamer (1970)
Q - ZT0070 Con Gia (1970)
R - ZT1019 Guin, 3/7 (1970)
S - ZS1399 Kow, 3/7 (1970)
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Long Bien / Bien Hoa
199th Light Infantry Brigade Areas of Operations/Base Locations
Allied Bases
1 - XT8418 Phu Loi, 1st Infantry Division Avaition
2 - XS8473 Can Giuoc, 9h Infantry Division
3 - XS9480 Nha Be Point, US Navy Seals and Aviation (Gunships)
4 - XT9505 Di An, 1st Infantry Division Rear
5 - XT9914 Bien Hoa Air Base and Military Complex (many units, including 173d Airborne Brigade HQs in early years, then 101st Airborne Division Rear)
6 - YTO406 US Army Vietnam (USARV) HQs and Military Complex (many support units)
7 - YTO409 90th Replacement Center
8 - YTO511 II Field Force Vietnam HQs
9 - YS1498 Bearcat/Long Thanh, 9th Infantry Division Rear and Royal Thai Regiment
199th Bases
A - XS8386 Twenty Two, 5/12, 3/7 (1968)
B - XS8478 Binh Duc, 2/3 (1967)
C - XS8780 Nhon Duc, 2/3 (1967)
D - XT9100 Thu Duc 2, 4/12 (1967)
E - XS8987 Blackfoot, 5/12 (1968)
F - XS9076 Long Duc 2, 2/3 (1967)
G - XS8961 French Fort, 2/3 (1967)
H - XS9182 Nha Be Shell, 2/3 (1967)
I - XS9594 Thu Duc, 4/12 (1967)
J - XS9589 Cat Lai, Bde Fwd HQs (1967)
K - YTO317 Concord, 2/3 (1967)
L - YTO712 Brigade Main Base (Camp Frenzell-Jones)(1966-1970)
M - YS0787 Em, 2/3 (1970)
N - YT1309 Paris, 5/12, 4/12, 3/7 (1968)
0 - YS1482 Phuoc Tho, 2/3, D-17 (1970)
P - YS1483 Nhon Trach, 3/7 (1970)
Q - YT2012 Tri-Corners, 2/3,3/7,4/12 (1967)
R - YT2112 Anderson(1968)
S - YT2609 Bev, 4/12 (1968)
T - YT2710 Verna/Bau Ca, 2/3, 5/12 (1969)
U - YS3097 Crystal, 2/3 (1969)
V - YT3200 Trung, 2/3 (1970)
W - YT3407 Boi Chan, 2/3
X - YS3799 Cam Tam, 2/3 (1969)
Y - YT3908 Tan Lap, 2/3 (1969)
Z - YT4110 An Loc, 2/3 (1969)
AA - YS4397 Blackhorse, HQs, 2/3 (1969)
BB - YT4608 Husky, HQs (1969)
CC - YT4611 Xuan Loc, HQs (1969)
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Saigon
199th Light Infantry BrigadeAreas of Operations/Base Locations
Allied Bases
1 - XS5997 Duc Hoa, 1st Special Forces A Team, 25h Infantry Division, 82d Airborne Division
2 - XS6314 Cu Chi, 25h Infantry Division HQs, later 101" Airborne Division (also elements of 199'h Bde HQs in 1968 during Tay Ninh operation)
3 - XT7404 Hoc Mon, 25th Infantry Division, 101st Armored Cav (during TET 1968)
4 - XS8296 Tan Son Nhut Air Base & Military Complex (many units, including Vietnamese Air Force HQs and most HQs for US support units in the Saigon area)
5 - XT8418 Phu Loi, 1st Infantry Division Avaition
6 - XS8473 Can Giuoc, 9th Infantry Division
7 - XS9480 Nha Be Point, US Navy Seals and Aviation (Gunships)
199th Bases
A - XS5785 Nancy, 5/12 (1968)
B - XS6288 Kathy/Ly Van Manh, 4/12, 3/7, 2/3 (1967)
C - XS6592 Claudette, 5/12 (1968)
D - XS6981 Name Unknown - near My Yen, 2/3 (1968)
E - XS7084 Name Unknown - West of Tri Hoa, 2/3 (1968)
F - XS7286 Name Unknown - Northwest of My Phu (1 969)
G - XS7179 Zindemuef, 2/3, 3/7, 4/12 (1968)
H - XS7178 Binh Chanh, 3/7, 2/3, 4/12 (1967)
I - XT7503 Hoc Mon/Nhi Binh, 4/12 (1967)
J - XS7590 Stephanie (1969)
K - XS7583 Binh Dinh, 2/3 (1968)
L - XS7470 Rach Kien, 4/12 (1969)
M - XS7787 Horseshoe Bend (Fishnet Factory), Bde Fwd HQs (1968/1969)
N - XS7784 Name Unknown - West of An Loc, 2/3 (1968)
O - XS7976 Smoke, 2/3 (1968)
P - XS8190 Phu Tho, 3/7 (1968)
Q - XS8180 Da Phuoc, 2/3 (1967)
R - XS8271 Madeline, 3/7 (1969)
S - XS8386 Twenty Two, 5/12 and 3/7 (1968)
T - XS8487 Binh Duc, 2/3 (1967)
U - XS8780 Nhon Duc, 2/3 (1967)
V - XS8987 Blackfoot, 5/12 (1968)
W - XS9076 Long Duc 2, 2/3 (1967)
X - XT9100 Thu Duc 2, 4/12 (1967)
Y - XS9182 Nha Be Shell, 2/3 (1967)
Z - XS8961 French Fort, 2/3 (1967) ?
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Tay Ninh
199th Light Infantry Brigade Areas of Operations/Base Locations
Allied Bases
1 - XS2447 Tay Ninh, 196th Infantry Brigade, 25th Infantry Division, 1st Air Cav Division (also elements of the 199th bde HQs in Tay Ninh operation)
2 - XS2858 Nui Ba Den, Special Forces A Team Radio Relay Site
3 - XS4948 Dau Tieng, 4th Infantry, 25 Infantry Division, 1st Air Cav
199th Bases
A - XT2035 Rain, 4/12 (1968)
B - XS2638 Bolt, 3/7 (1968)
C - XS3631 Storm, (1968)
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War Zone D North of Bien Hoa
199th Light Infantry Brigade Areas of Operations/Base Locations
Allied Bases
XT9649 Phuoc Vinh, 1st Infantry, 101 Airborne, 1st Air Cav - also elements of 3/7 and 4/12 in 1967
199th Bases
A - YT9832 Nashua, 4/12,2/3 (1967)
B - YT0435 Chapultepec, 3/7,5/12 (1968)
C - YT7714 Keane, (1967)
D - YT0424 Lois, 3/7,4/12 (1968)
E - YT0222 Choctaw, 5/12,3/7 (1968)
F - YT1740 Melinda, 3/7 (1970)
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Xuan Loc
199th Light Infantry Brigade Areas of Operations/Base Locations
199th Bases
A - YT1923 New Orleans, 3/7 (1968)
B - YT2012 Tri-Corners, 2/3, 3/7, 4/12 (1967)
C - YT2112 Anderson (1968)
D - YT2609 Bev 4/12 (1968)
E - YT2710 Verna/Bau ca, 2/3,5/12 (1969)
F - YT3025 Farrell 4/12 (1968)
G - YS3097 Crystal 2/3 (1969)
H - YT3200 Trung, 2/3 (1970)
I - YT3407 Boi Chan, 2/3
J - YS3799 Cam Tam 2/3 (1969)
K - YT3908 Tan Lap, 2/3 (1969)
L - YT4110 An Loc, 2/3 (1969)
M - YS4397 Blackhorse, HQs, 2/3 (1969)
N - YT4608 Husky, HQs (1969) (corrdinates off- maybe artillery base)
0 - YT4611 Xuan Loc HQs (1969)
P - YT5906 Cau Bau, 2/3 (1970)
Q - YT6010 Signal Mountain, Radio Relay (1969)
R - YT6211 Mace 3/7, HQs, 2/3 (1969)
S - YS6399 Dao, 4/12, 3/7 (1970)
T - YS6798 Miller (1970)
U - YT6825 Joy, 4/12 (1969)
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Just wanted to share. T G C!
Sincerely
A.B