Tanker's Final Exam, Part 3, Machine Guns and HE

After the first two engagements, coax machine gun then HEAT at a 1600-meter target, the next two engagements were machine guns against troop targets.

We are supposed to keep moving while firing machine guns.  As we moved away after firing the cannon, I said "Driver Steady" over the headset.  Merc and I had practiced for hours holding our sights steady on an area target while Burhans smoothly steered the tank down the trail.  He held 10 mph while the loader and I scanned the horizon.  The .50 cal. target came  first.  Troop silhouettes off to the left at 1200 meters, almost 3/4ths of a mile.

When Pierce called the target, I swung the turret close to the area, then dropped down to refine the aim through the .50 cal. sight.  Burhans slowed to 5 mph.  I had been cautioned over and over by our platoon sergeant not to "Cowboy" the commander's machine gun.  I only had 50 rounds to bring effective fire on those targets.  That meant the 2nd tracer better be on target, if not the first.  Firing the .50 by eyeball is fun, but not accurate.  I aimed through the site, kept my burst short and put effective fire on the troop targets.

Next were troops at just 500 meters.  As soon as we saw then, Pierce dropped down in the turret in case the coax jammed.  I swung the target in the area and yelled "Gunner, Coax Troops."

Merc took the control and put nearly all of the hundred rounds into those troop panels.  Burhans held us at a steady 5 mph while Merc fired, then eased up to 10 mph again when I called "Cease Fire."

When we rounded the next bend, Merc was ready for the shortest shot, but one that would catch other crews out.  We fired at a panel at 900 meters with High Explosive.  This was the round we fired with the telescope, not the main sight connected to the stereoscopic range finder.

Merc had no problem.  Months of practice and the relatively short firing distance meant he was ready to hit the small panel with the slower high explosive round.  HE has a muzzle velocity of just 2,450 feet per second, less than half the speed of SABOT armor-piercing rounds.  A 900-meter shot with SABOT was point and shoot.  With HE the ballistic path took the round many yards above the target before it dropped through.

When Pierce spotted the target (He was very good at picking out targets.) I swung the turret and yelled, "Gunner HE Anti Tank."

Pierce already had HE loaded and the next round cradled in his arms.

Merc refined his aim.  We waited two extra seconds for this telescope shot but it seemed a lot longer.

"On the Way," Merc yelled and the tank rocked back.  Pierce yelled "Up" announcing the gun was reloaded just a second after the tracer showed that the HE round passed through the panel.  I announced "Hit."  The grader concurred.  Merc yelled "On the Way" and the second round passed through the panel.

I said "Driver Move Out" and tapped Merc on the shoulder with my foot.  Pierce reached over the gun and whacked Merc on the helmet.  We could lose points for unnecessary chatter on the headsets, so Pierce had to jump down and hit Merc on the head, in the most affectionate way.  Pierce was grinning.  He knew we were tearing this range up.  But the next engagement would be tough.  Moving tank.

Tankers Final Exam, Part 2 "Gunner, HEAT, Tank"

After the first engagement, we rolled down the firing lane scanning the trees and dunes ahead on the range at Fort Carson in southern Colorado.  Off to the left just over a mile away, a 6 by 6 wood panel popped and I yelled my favorite fire command into the headset:

Gunner, HEAT, Tank!

At the moment, Burhans brought the tank to a smooth halt.  I traversed the turret left and got the gun on the target.  While the turret traversed Geno loaded a HEAT round into the chamber and yelled "Up" announcing the main gun was loaded and ready to fire. The High Explosive Anti Tank round has a projectile shaped like a whiskey bottle.

The round detonates when the nose of the round touches the target, but the detonation is at the back of the round.  It forms a shaped charged that burns a hole through up to a foot of armor plate.  An explosive shell would not penetrate half that much armor.  The best round for punching through armor plate is the solid-shot SABOT.  We'll get to that later.

With HEAT loaded, Merc moved the sights to center of mass of the panel, shouted "On the way" and fired.  The tank rocked back as the main gun recoiled, splitting the turret in half.  The spent cartridge from HEAT round clattered to the metal floor of the turret.  Geno slammed another HEAT round into the chamber and yelled "Up."  I saw the tracer pass through the panel with my binoculars and announced "Hit."

One of the advantages of HEAT over the more effective SABOT round for the tank commander, is that it is easier to adjust fire.  With a muzzle velocity of 3,850 feet per second, the HEAT round took two seconds to travel from the gun to the target.  The SABOT round covers the same distance in just over a second.  That extra second gives me a better chance of seeing through the huge cloud of smoke and flame coming from the gun muzzle.

Merc refined his aim as he always did, announced "On the way" and fired.  Another round, another hole in the panel.  "Driver, Move Out."

Next, machine guns.

Remembering the Tanker's Final Exam

The Moment After the 105mm Round Goes Downrange

Last post ended when my crew and I lined up for the moving range at my first annual tank gunnery.  It was April 1976.  I had enlisted in the Army the year before after spending 2-1/2 years in the Air Force.  I was a Specialist at enlistment in June of 1975, got promoted to Sergeant in January and was a tank commander.  For the driver, PFC Richard Burhans, and I it was our first gunnery.  For the loader, PFC Gene Pierce, this would be his second annual gunnery.  My loader, SPC "Merc" Morris, had been a loader in the two previous years.  This would be his first time as a gunner.  

And gunner was the position The Lord made him for.

Merc was a rumpled, complaining, lousy soldier in many ways, but was good with numbers and could think quickly and clearly about ranges, ammo and adjusting fire.   

As we rolled onto the range we loaded ammo and waited in springtime sun in Colorado.  Blue sky, little wind, and lots of nerves.  The moving range takes the crew down a lane with nine targets.  Four main gun targets, three coaxial machine gun targets, and two .50 caliber machine gun targets.  The "Coax" machine gun is a 7.62mm, belt-fed weapon mounted parallel or coaxially with the main gun.  The .50-cal is fired by the commander in the cupola on top of the tank.

After the command "Driver, Move Out" we move slowly down the range.  We are all scanning left, right and front for targets.  The first targets pop up to the right: troop targets at 400 meters.

Before I talk about firing, a word about crew commands.  The fire command is primarily for the gunner, but tells the whole crew to do something.  The format is: Alert, Ammo, Target.  So for the first engagement, when I saw the troop targets, I used the commanders override turret control to swing the turret close to the target area.  As I swung the turret, the driver brought the tank to a smooth stop and I said, "Gunner. Coax. Troops."

Merc then brought the sights to the center of the troop concentration and announced "On the way" as he squeezed the trigger.  The loader made sure the ammo belt was feeding smoothly into the coaxial machine gun while the gunner fired.

Before the new tanks with stabilized sights and guns, tanks fired from the halt.  So every time I issued a fire command, the driver's job was to bring the tank smoothly to a halt as level as possible.

Merc put a dozen tracers in the area--a total of 60 rounds.  I called ""Cease Fire!"  And then "Driver, Move Out."

The whole crew scanned for targets.  To the left, a tank-sized panel popped up.  First main gun engagement.

More next post. . .