Current buoy in water in Penobscot Bay. Deployment off of FERREL

NOAA Launch 1255 with crane for handling current buoys and meters. Launch 1255 worked with FERREL in Penobscot Bay

Current meter with trash catcher to keep impeller from being fouled. Deployed off of FERREL

Bottom mounted current meter being deployed from FERREL. Project to determine path of brine plume from salt dome solution and pumping. Studies during formation of Strategic Petroleum Reserve

Colonel E. Lester Jones and Honorable J. D. Craig. On EXPLORER on International Boundary Commission inspection tour. Colonel Jones was a founder of the American Legion

Picking up pilot and radio operator from recon airplane off Oahu. Plane ran out of fuel and landed on water searching for Japanese fleet. Picked up by EXPLORER 3 days after Pearl Harbor

Route of 17th Field Artillery Observation Battalion through Belgium and Germany. 17th FAOB was on the north shoulder of the Bulge. Photo from 17th FAOB Album

Route of 17th Field Artillery Observation Battalion through England and France. 17th FAOB landed one day after D-Day. Engaged at Falaise Gap in France, marched through Paris

Training maneuvers on the Dartmoors prior to D-Day. Personnel of the 17th FAOB. Photo from 17th FAOB Album

Meteorological observations on the Dartmoors. 17th FAOB training exercises prior to D-Day. Photo from 17th FAOB Album

Transit party training on the Dartmoors. 17th FAOB training exercises prior to D-Day. Photo from 17th FAOB Album

Lieutenant Fountain and Sergeant Newton on reconnaissance training. 17th FAOB training exercises prior to D-Day. Photo from 17th FAOB Album

Survey party entering Vire, France, shortly after D-Day. 17th FAOB. Photo from 17th FAOB Album

Flash ranging command post overlooking the Rhine River. 17th FAOB. Photo from 17th FAOB Album

Flash ranging command post overlooking the Rhine River. 17th FAOB. Photo from 17th FAOB Album

Survey work at Kesternich. 17th FAOB. Photo from 17th FAOB Album

Members of 17th FAOB at Ehrenbreitstein Fortress. L to R - Deily, Bacon, Richey, Harding, Riback, Snyder, Stewart. Photo from 17th FAOB Album

Frontispiece from the History of the 17th Field Artillery Observation Battalion. Image from 17th FAOB Album

All in a days work for the members of the 17th FAOB. Shooting, running line, stopping for chow, rodman, and observer with transit. Image from 17th FAOB Album

Running the transit - survey work with the 17th FAOB. Image from 17th FAOB Album

Route of the 8th FAOB. Image from the 8th FAOB Album

Diagram of sound ranging coverage with artillery firing possibilities. Image from the 8th FAOB Album

Sound ranging operations of 8th FAOB. 70 sound bases established in less than one year. Image from the 8th FAOB Album

Flash observer at work. 25 flash bases established. Image from the 8th FAOB Album.

Over 4,000 miles of wire laid to communicate with sound and flash ranging bases. Image from the 8th FAOB Album

Flash ranging operations. Image from the 8th FAOB Album

Composite of all operations associated with 8th FAOB. Image from the 8th FAOB Album

The bottom line - determined 7,016 enemy targets for Allied artillery. Image from the 8th FAOB Album

Captured German map showing geodetic control around St. Nazaire, France.

Title page of captured German geodetic control book for St. Nazaire.

Listing of geodetic control points with rectangular coordinates. From captured German geodetic control book for St. Nazaire

Listing of geodetic control points with rectangular coordinates. From captured German geodetic control book for St. Nazaire

Diagrams of objects used to establish azimuth for orienting artillery. From captured German geodetic control book for St. Nazaire

Sketches with maps of various geodetic control points. From captured German geodetic control book for St. Nazaire

Group photograph of ill-fated Battery B of the 285th FAOB. Major Fair J. Bryant was executive officer and survey officer of the 285th FAOB.

"Malmedy Massacre" - approximately 70 members of Battery B killed after captured . Fair J. Bryant was travelling with Battery A of 285th at time of massacre. Occurred at beginning of Battle of the Bulge

Commander Maurice A. Hecht at left - first instructor for radar ranging class. Observation battalion training in use of radar to determine enemy gun location

Officers' Sound and Flash Ranging Class No. 16. #9- Harry D. Reed; #11 - Charley Schanck; #12 C. M. Shinn

Typical Corps Survey Problem. Illustrating the complexity of battlefield surveying

Francis X. Popper plotting hydrographic survey in New Guinea. Regimental navigator for Army amphibious engineers. May and Larusso standing guard

Chart of Efate Island produced on board the PATHFINDER. Printed on board in July 1943. Green areas denote wiredrag coverage

Chart of Lifa-Uvea Passage produced on board the PATHFINDER. Printed on board in September 1944

Massacre Bay. HYDROGRAPHER led transports and combatants to anchorage areas during invasion

Marine mapping party working with a plane table. Photo from article in Military Engineer

Marine photographic intelligence work. Photo from article in Military Engineer

Relief map of Truk Island developed to guide bombing missions. Work of Roswell Bolstad while Marine intelligence officer

Approach recognition chart of Truk Islands. Chart shows varying aspects of Truk while approaching from different directions . Work of Roswell Bolstad while Marine intelligence officer

Anti-aircraft battery at Guadalcanal commanded by Robert A. Earle. Early use of C&GS by Marines

Artillery survey crew of 10th Marines with 3 captured Japanese battle flags. Survey crew caught in middle of huge Japanese banzai charge at Battle of Saipan . Robert A. Earle, in center front, commanding officer of survey crew

Artillery survey crew of 10th Marines with survey gear. Commanded by Robert A. Earle, back row 4th from left