front-line

[ fruhnt-lahyn ]

/ ˈfrʌntˌlaɪn /

located or designed to be used at a military front line: a front-line ambulance helicopter.

of, relating to, or involving the forefront in any action, activity, or field: a front-line TV reporter.

highly experienced or proficient in the performance of one's duties.

Origin of front-line

First recorded in 1910–15

front line

front(def 9).

the visible forefront in any action, activity, or field: TV reporters are constantly involved in the front line of events.

Football. front four.

Basketball. front court(def 2b).

First recorded in 1915–20

When [lawmakers] looked at it holistically, did they want to take away equipment and technology from front-line security?

SWAT Lobby Shoots to Kill Police Reform After Ferguson |Tim Mak |December 2, 2014 |DAILY BEAST
In other words, the bulk of the front-line security for U.S. bases has been provided by private companies.

Can Private Security Guards Protect Military Bases? |Adrian Bonenberger |April 9, 2014 |DAILY BEAST
The women are Charlotte, who will become a front-line nurse, and Greta, who will pursue her ambitions as a singer.

‘Generation War’ Lets World War II Germans Off Too Easily |Jack Schwartz |January 26, 2014 |DAILY BEAST
But they still will be barred from front-line infantry and special-op forces.

U.S. Eases Restrictions on Women in Combat, Still Bars Them From Front Lines |Jesse Ellison |February 10, 2012 |DAILY BEAST

To some degree as well, Israelis calm themselves by being the region's only producer of front-line military equipment.

Mideast Arms Sales Not So Bad |Leslie H. Gelb |April 12, 2011 |DAILY BEAST
I came back from the front-line all right and have since been hard at it firing.

Carry On |Coningsby Dawson
Cohan stood about five miles back from the front-line trenches and so was under frequent artillery fire.

With the Doughboy in France |Edward Hungerford
General Burn, therefore, decided to relieve the two front-line battalions.

The History of the 51st (Highland) Division 1914-1918 |Frederick William Bewsher
Goodness knows where the "present Front-line" may be by the time this book is published.

Out To Win |Coningsby Dawson
During the second fortnight a strong German attack broke down before the front-line trenches near Bixschoote.

Ypres and the Battles of Ypres |Unknown

front line

military the most advanced military units or elements in a battle

the most advanced, exposed, or conspicuous element in any activity or situation

frontline (modifier)

of, relating to, or suitable for the front line of a military formationfrontline troops
British of, relating to, or suitable for public service and business employees who are in direct contact with the publicfrontline staff
to the fore; advanced, conspicuous, etcfrontline news
of or relating to a country bordering on or close to a hostile country or scene of armed conflictleaders of the frontline states attended the summit